Để phân biệt các chất: glucozơ, glixerol, anđehit axetic, ancol etylic và lòng trắng trứng người ta dùng: 

Tiến hành điện phân dung dịch CuSO₄ và NaCl bằng điện cực trơ, màng ngăn xốp với cường dòng điện không đổi, ta có kết quả ghi theo bảng sau:

Giá trị của t là:

Read the following passage and mark the letter A, B, C, or D to indicate the answer to each of the question.

Vietnam’s population is ageing quickly. In 2017, more than 10 per cent of the population will be 60 and older, and in 15-20 years the elderly will account for one third of the total population. This raises concerns about healthcare, welfare and pensions for the elderly at a time when Vietnam is focusing on economic integration and requires a large labor force. So far two solutions have been proposed: to loosen the two-child policy and to increase the retirement age to 58 for women and 62 for men. By ending the two-child policy the government expects to make up for the ageing population within the next 20

years. But its effect could be creating an uncontrollable boom in the Vietnamese population. When the government loosened the two-child policy in 2015 in a trial period, in the first 6 months of 2016 the third child birth rate increased remarkably by 7.5 per cent

          Raising the retirement age has been proposed by the Ministry of Labor pending parliamentary evaluation in May 2017. While the policy is beneficial in utilizing the work experience of the elderly while creating savings in the pension budget, it also means fewer job prospects and promotion opportunities for younger generations. It is also not in the interest of all the elderly, especially the 70 per cent of Vietnam's labor force working in manual labor-intensive sectors such as agriculture, manufacturing and construction where working above the age of 50 can be dangerous and unproductive. Despite these drawbacks, raising the retirement age is still considered by policymakers as one of the key solutions to the ageing population problem in Vietnam. However, these are only temporary solutions.

Which statement is probably TRUE according to the information in the paragraph 1?

Bệnh nhân suy nhược phải tiếp đường (tiêm hoặc truyền dung dịch đường vào tĩnh mạch), đó là loại đường nào sau đây?

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

______, I decided to stop trading with them.

Thí nghiệm nào sau đây không xảy ra phản ứng

Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs  from the other three in pronunciation in each of the following questions

Hỗn hợp X gồm Al, Al₂O₃, Na và Na₂O (trong đó nguyên tố O chiếm 18,64% về khối lượng). Hòa tan hoàn toàn 10,3 gam hỗn hợp X vào nước thu được dung dich Y 4,256 lít H₂ (đktc). Cho từ từ dung dịch HCl vào dung dịch Y. Thấy đồ thị biểu diễn số mol kết tủa thu được với số mol HCl như sau:

Giá trị của x là:     

Có các chất hữu cơ: lòng trắng trứng, anilin và glucozơ. Hóa chất dùng làm thuốc thử phân biệt các chất trên bằng phương pháp hóa học là:

Tiến hành thí nghiệm với các chât X, Y, Z, T. Kết quả được ghi ở bảng sau:

Các chất X, Y, Z, T lần lượt là:

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

We arrived home late last night. We _____ to wait half an hour for a taxi.

Cho dãy các kim loại: Be, Na, Fe, Ca. Số kim loại phản ứng được với nước ở điều kiện thường là 

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions .

Computer programmer David Jones earns £35,000 a year designing new computer games, yet he cannot find a bank prepared to let him have a cheque card. Instead, he has been told to wait another two years, until he is 18.

The 16-year-old works for a small firm in Liverpool, where the problem of most young people of his age is finding a job. David's firm releases two new games for the expanding home computer market each month. But David's biggest headache is what to do with his money.

Despite his salary, earned by inventing new programs within tight schedules, with bonus payments and profit-sharing, he cannot drive a car, take out a mortgage, or obtain credit cards.

He lives with his parents in their council house in Liverpool, where his father is a bus driver. His company has to pay £150 a month in taxi fares to get him the five miles to work and back every day because David cannot drive.

David got his job with the Liverpool-based company four months ago, a year after leaving school with six O-levels and working for a time in a computer shop. "I got the job because the people who run the firm knew I had already written some programs," he said.

"I suppose £35,000 sounds a lot but actually that's being pessimistic. I hope it will come to more than that this year." He spends some of his money on records and clothes, and gives his mother £20 a week. But most his spare time is spent working.

"Unfortunately, computing was not part of our studies at school," he said. "But 1 had been studying it in books and 'magazines for four years in my spare time. 1 knew what 1 wanted to do and never considered staying on at school. Most people in this business are fairly young, anyway."

David added: "I would like to earn a million and 1 suppose early retirement is a possibility. You never know when the market might disappear."

The word " releases " in the reading passage can be replaced by___.

Nhóm các kim loại nào sau đây đều tác dụng được với nước lạnh tạo dung dịch kiềm

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

Deforestation _____ devastative floods in many parts of the world.

Để phân biệt cặp chất nào sau đây cùng với thuốc thử hoặc phản ứng là phù hợp? 

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions .

Computer programmer David Jones earns £35,000 a year designing new computer games, yet he cannot find a bank prepared to let him have a cheque card. Instead, he has been told to wait another two years, until he is 18.

The 16-year-old works for a small firm in Liverpool, where the problem of most young people of his age is finding a job. David's firm releases two new games for the expanding home computer market each month. But David's biggest headache is what to do with his money.

Despite his salary, earned by inventing new programs within tight schedules, with bonus payments and profit-sharing, he cannot drive a car, take out a mortgage, or obtain credit cards.

He lives with his parents in their council house in Liverpool, where his father is a bus driver. His company has to pay £150 a month in taxi fares to get him the five miles to work and back every day because David cannot drive.

David got his job with the Liverpool-based company four months ago, a year after leaving school with six O-levels and working for a time in a computer shop. "I got the job because the people who run the firm knew I had already written some programs," he said.

"I suppose £35,000 sounds a lot but actually that's being pessimistic. I hope it will come to more than that this year." He spends some of his money on records and clothes, and gives his mother £20 a week. But most his spare time is spent working.

"Unfortunately, computing was not part of our studies at school," he said. "But 1 had been studying it in books and 'magazines for four years in my spare time. 1 knew what 1 wanted to do and never considered staying on at school. Most people in this business are fairly young, anyway."

David added: "I would like to earn a million and 1 suppose early retirement is a possibility. You never know when the market might disappear."

The word " pessimistic " in the reading passage probably means____.

Read the following passage and mark the letter A, B, C, or D to indicate the answer to each of the question.

Vietnam’s population is ageing quickly. In 2017, more than 10 per cent of the population will be 60 and older, and in 15-20 years the elderly will account for one third of the total population. This raises concerns about healthcare, welfare and pensions for the elderly at a time when Vietnam is focusing on economic integration and requires a large labor force. So far two solutions have been proposed: to loosen the two-child policy and to increase the retirement age to 58 for women and 62 for men. By ending the two-child policy the government expects to make up for the ageing population within the next 20

years. But its effect could be creating an uncontrollable boom in the Vietnamese population. When the government loosened the two-child policy in 2015 in a trial period, in the first 6 months of 2016 the third child birth rate increased remarkably by 7.5 per cent

          Raising the retirement age has been proposed by the Ministry of Labor pending parliamentary evaluation in May 2017. While the policy is beneficial in utilizing the work experience of the elderly while creating savings in the pension budget, it also means fewer job prospects and promotion opportunities for younger generations. It is also not in the interest of all the elderly, especially the 70 per cent of Vietnam's labor force working in manual labor-intensive sectors such as agriculture, manufacturing and construction where working above the age of 50 can be dangerous and unproductive. Despite these drawbacks, raising the retirement age is still considered by policymakers as one of the key solutions to the ageing population problem in Vietnam. However, these are only temporary solutions.

The best title for this passage could be ________.

Dãy gồm các kim loại đều phản ứng với nước ở nhiệt độ thường tạo ra dung dịch có môi trường kiềm là

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.

        Instructors at American colleges and universities use many different teaching methods. Some instructors give assignments everyday. They grade homework. Students in their classes have to take many quizzes, a midterm exam, and a final test. Other instructors give only writing assignments. Some teachers always follow a course outline and usually use the text book. Others send students to the library for assignments.

        The atmosphere in some classrooms is very formal. Students call their instructors “Professor Smith,” “Mrs Jones,” and so on. Some teachers wear business clothes and give lectures. Other classrooms have an informal atmosphere. Students and teachers discuss their ideas. Instructors dress informally, and students call them by their first names. American teachers are not alike in their teaching styles.

        At most American colleges and universities, facilities for learning and recreation are available to students. Students can often use type-writers, tape recorders, video machines, and computers at libraries and learning centres. They can buy books, notebooks, and other things at campus stores. They can get advice on their problems from counselors and individual help with their classes from tutors. Students can relax and have fun on campus, too. Some schools have swimming pools and tennis courts. Most have snack bars and cafeterias.

What does the phrase “business clothes” in paragraph 2 mean?

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions .

Computer programmer David Jones earns £35,000 a year designing new computer games, yet he cannot find a bank prepared to let him have a cheque card. Instead, he has been told to wait another two years, until he is 18.

The 16-year-old works for a small firm in Liverpool, where the problem of most young people of his age is finding a job. David's firm releases two new games for the expanding home computer market each month. But David's biggest headache is what to do with his money.

Despite his salary, earned by inventing new programs within tight schedules, with bonus payments and profit-sharing, he cannot drive a car, take out a mortgage, or obtain credit cards.

He lives with his parents in their council house in Liverpool, where his father is a bus driver. His company has to pay £150 a month in taxi fares to get him the five miles to work and back every day because David cannot drive.

David got his job with the Liverpool-based company four months ago, a year after leaving school with six O-levels and working for a time in a computer shop. "I got the job because the people who run the firm knew I had already written some programs," he said.

"I suppose £35,000 sounds a lot but actually that's being pessimistic. I hope it will come to more than that this year." He spends some of his money on records and clothes, and gives his mother £20 a week. But most his spare time is spent working.

"Unfortunately, computing was not part of our studies at school," he said. "But 1 had been studying it in books and 'magazines for four years in my spare time. 1 knew what 1 wanted to do and never considered staying on at school. Most people in this business are fairly young, anyway."

David added: "I would like to earn a million and 1 suppose early retirement is a possibility. You never know when the market might disappear."

Why does David think he might retire early?

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

Vietnam reached the semi-finals of the AFC U23 Championship 2018 with a penalty shootout win _____ Iraq on Saturday, January 20th, 2018.

Thực hiện phản ứng sau trong bình kín: H₂ (k) + Br₂ (k) → 2HBr (k)

Lúc đầu nồng độ hơi Br₂ là 0,072 mol/l. Sau 2 phút, nồng độ hơi Br₂, còn lại là 0,048 mol/l. Tốc độ trung bình của phản ứng tính theo Br₂ trong khoảng thời gian trên là

Có các dung dịch riêng biệt sau: glucozơ, glixerol, metanol, lòng trắng trứng. Thuốc thử để phân biệt các dung dịch trên là

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.

        Instructors at American colleges and universities use many different teaching methods. Some instructors give assignments everyday. They grade homework. Students in their classes have to take many quizzes, a midterm exam, and a final test. Other instructors give only writing assignments. Some teachers always follow a course outline and usually use the text book. Others send students to the library for assignments.

        The atmosphere in some classrooms is very formal. Students call their instructors “Professor Smith,” “Mrs Jones,” and so on. Some teachers wear business clothes and give lectures. Other classrooms have an informal atmosphere. Students and teachers discuss their ideas. Instructors dress informally, and students call them by their first names. American teachers are not alike in their teaching styles.

        At most American colleges and universities, facilities for learning and recreation are available to students. Students can often use type-writers, tape recorders, video machines, and computers at libraries and learning centres. They can buy books, notebooks, and other things at campus stores. They can get advice on their problems from counselors and individual help with their classes from tutors. Students can relax and have fun on campus, too. Some schools have swimming pools and tennis courts. Most have snack bars and cafeterias.

Which of the following statements is TRUE?

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions .

Computer programmer David Jones earns £35,000 a year designing new computer games, yet he cannot find a bank prepared to let him have a cheque card. Instead, he has been told to wait another two years, until he is 18.

The 16-year-old works for a small firm in Liverpool, where the problem of most young people of his age is finding a job. David's firm releases two new games for the expanding home computer market each month. But David's biggest headache is what to do with his money.

Despite his salary, earned by inventing new programs within tight schedules, with bonus payments and profit-sharing, he cannot drive a car, take out a mortgage, or obtain credit cards.

He lives with his parents in their council house in Liverpool, where his father is a bus driver. His company has to pay £150 a month in taxi fares to get him the five miles to work and back every day because David cannot drive.

David got his job with the Liverpool-based company four months ago, a year after leaving school with six O-levels and working for a time in a computer shop. "I got the job because the people who run the firm knew I had already written some programs," he said.

"I suppose £35,000 sounds a lot but actually that's being pessimistic. I hope it will come to more than that this year." He spends some of his money on records and clothes, and gives his mother £20 a week. But most his spare time is spent working.

"Unfortunately, computing was not part of our studies at school," he said. "But 1 had been studying it in books and 'magazines for four years in my spare time. 1 knew what 1 wanted to do and never considered staying on at school. Most people in this business are fairly young, anyway."

David added: "I would like to earn a million and 1 suppose early retirement is a possibility. You never know when the market might disappear."

He left school after taking O-levels because ____.

Este ${\mathrm{C}}_4{\mathrm{H}}_6{\mathrm{O}}_2$ thủy phân trong môi trường axit thu được hỗn hợp không tham gia phản ứng tráng bạc. Công thức cấu tạo thu gọn của este là

Có 3 dung dịch glucozơ, fructozơ, anilin đựng riêng biệt trong 3 lọ mất nhãn. Thuốc thử có thể dùng để phân biệt 3 dung dịch trên là 

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

_____ the film's director, Ben Affleck, was famously left off the 85th Oscar's Best  Director list of nominees surprised everyone.

Read the following passage and mark the letter A, B, C, or D to indicate the correct word or phrase that best fits each the numbered blanks.

Setting up and running a car company was an expensive business and required a lot of workers. A company that makes its money out of a smart app requires less capital, doesn't have to pay (25) _____ storage or transport in the way that car companies do and (26) _____ virtually no extra costs as the number of users increases. In the jargon of economics, the marginal costs per unit of output tend towards zero and the returns to scale are high. This explains why tech entrepreneurs can get very rich very young.

Technological change has always been (27) _____. There was a polarization of income and wealth in the first wave of industrialization at the beginning of the 19^th century, and this gave rise to political and institutional change over the 100 years between 1850 and 1950: the spread of democracy, the emergence of trade unions; progressive taxation and the development of social safety nets. These helped create bigger markets for the consumer goods that were spawned by the second Industrial Revolution: TVs, radios, vacuum cleaners and the like. (28) _____ over the past four decades a political model that both facilitated the spread of technology and provided some protection against its disruptive consequences has come under attack. Welfare states have become less generous, levels of long-term unemployment are much higher, taxation has become less progressive, and politics has increasingly been dominated by those with the deepest pockets (29) _____ can lobby the loudest.

Điền vào số (29)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.

        Instructors at American colleges and universities use many different teaching methods. Some instructors give assignments everyday. They grade homework. Students in their classes have to take many quizzes, a midterm exam, and a final test. Other instructors give only writing assignments. Some teachers always follow a course outline and usually use the text book. Others send students to the library for assignments.

        The atmosphere in some classrooms is very formal. Students call their instructors “Professor Smith,” “Mrs Jones,” and so on. Some teachers wear business clothes and give lectures. Other classrooms have an informal atmosphere. Students and teachers discuss their ideas. Instructors dress informally, and students call them by their first names. American teachers are not alike in their teaching styles.

        At most American colleges and universities, facilities for learning and recreation are available to students. Students can often use type-writers, tape recorders, video machines, and computers at libraries and learning centres. They can buy books, notebooks, and other things at campus stores. They can get advice on their problems from counselors and individual help with their classes from tutors. Students can relax and have fun on campus, too. Some schools have swimming pools and tennis courts. Most have snack bars and cafeterias.

Where do students call their instructors “Professor Smith,” “Mrs Jones,”?

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions .

Computer programmer David Jones earns £35,000 a year designing new computer games, yet he cannot find a bank prepared to let him have a cheque card. Instead, he has been told to wait another two years, until he is 18.

The 16-year-old works for a small firm in Liverpool, where the problem of most young people of his age is finding a job. David's firm releases two new games for the expanding home computer market each month. But David's biggest headache is what to do with his money.

Despite his salary, earned by inventing new programs within tight schedules, with bonus payments and profit-sharing, he cannot drive a car, take out a mortgage, or obtain credit cards.

He lives with his parents in their council house in Liverpool, where his father is a bus driver. His company has to pay £150 a month in taxi fares to get him the five miles to work and back every day because David cannot drive.

David got his job with the Liverpool-based company four months ago, a year after leaving school with six O-levels and working for a time in a computer shop. "I got the job because the people who run the firm knew I had already written some programs," he said.

"I suppose £35,000 sounds a lot but actually that's being pessimistic. I hope it will come to more than that this year." He spends some of his money on records and clothes, and gives his mother £20 a week. But most his spare time is spent working.

"Unfortunately, computing was not part of our studies at school," he said. "But 1 had been studying it in books and 'magazines for four years in my spare time. 1 knew what 1 wanted to do and never considered staying on at school. Most people in this business are fairly young, anyway."

David added: "I would like to earn a million and 1 suppose early retirement is a possibility. You never know when the market might disappear."

He was employed by the company because _____.

Để phân biệt dung dịch H₂NCH₂COOH , CH₃COOH và C₂H₅NH₂ chỉ cần dùng một thuốc thử là 

Read the following passage and mark the letter A, B, C, or D to indicate the correct word or phrase that best fits each the numbered blanks.

Setting up and running a car company was an expensive business and required a lot of workers. A company that makes its money out of a smart app requires less capital, doesn't have to pay (25) _____ storage or transport in the way that car companies do and (26) _____ virtually no extra costs as the number of users increases. In the jargon of economics, the marginal costs per unit of output tend towards zero and the returns to scale are high. This explains why tech entrepreneurs can get very rich very young.

Technological change has always been (27) _____. There was a polarization of income and wealth in the first wave of industrialization at the beginning of the 19^th century, and this gave rise to political and institutional change over the 100 years between 1850 and 1950: the spread of democracy, the emergence of trade unions; progressive taxation and the development of social safety nets. These helped create bigger markets for the consumer goods that were spawned by the second Industrial Revolution: TVs, radios, vacuum cleaners and the like. (28) _____ over the past four decades a political model that both facilitated the spread of technology and provided some protection against its disruptive consequences has come under attack. Welfare states have become less generous, levels of long-term unemployment are much higher, taxation has become less progressive, and politics has increasingly been dominated by those with the deepest pockets (29) _____ can lobby the loudest.

Điền vào số (28)

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

Quang Hai's _____ in the final match between Vietnam and Uzbekistan was voted the most beautiful goal on AFC's website.

Ở điều kiện thường, kim loại nào sau đây không phản ứng với nước

Hỗn hợp X gồm CaC₂, Al₄C₃, Ca, Al. Cho 12,76 gam X vào nước dư chỉ thu được dung dịch Y và hỗn hợp khí Z gồm ba khí. Đốt cháy hoàn toàn Z, thu được 1,792 lít CO₂ ở đktc và 8,28 gam H₂O. Nhỏ từ từ dung dịch HCl vào dung dịch Y, kết quả được biểu diễn theo đồ thị sau:

Giá trị của x là:

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions .

Computer programmer David Jones earns £35,000 a year designing new computer games, yet he cannot find a bank prepared to let him have a cheque card. Instead, he has been told to wait another two years, until he is 18.

The 16-year-old works for a small firm in Liverpool, where the problem of most young people of his age is finding a job. David's firm releases two new games for the expanding home computer market each month. But David's biggest headache is what to do with his money.

Despite his salary, earned by inventing new programs within tight schedules, with bonus payments and profit-sharing, he cannot drive a car, take out a mortgage, or obtain credit cards.

He lives with his parents in their council house in Liverpool, where his father is a bus driver. His company has to pay £150 a month in taxi fares to get him the five miles to work and back every day because David cannot drive.

David got his job with the Liverpool-based company four months ago, a year after leaving school with six O-levels and working for a time in a computer shop. "I got the job because the people who run the firm knew I had already written some programs," he said.

"I suppose £35,000 sounds a lot but actually that's being pessimistic. I hope it will come to more than that this year." He spends some of his money on records and clothes, and gives his mother £20 a week. But most his spare time is spent working.

"Unfortunately, computing was not part of our studies at school," he said. "But 1 had been studying it in books and 'magazines for four years in my spare time. 1 knew what 1 wanted to do and never considered staying on at school. Most people in this business are fairly young, anyway."

David added: "I would like to earn a million and 1 suppose early retirement is a possibility. You never know when the market might disappear."

David's greatest problem is _____.

Ở điều kiện thường, kim loại nào sau đây tác dụng mạnh với H₂O

Read the following passage and mark the letter A, B, C, or D to indicate the correct word or phrase that best fits each the numbered blanks.

Setting up and running a car company was an expensive business and required a lot of workers. A company that makes its money out of a smart app requires less capital, doesn't have to pay (25) _____ storage or transport in the way that car companies do and (26) _____ virtually no extra costs as the number of users increases. In the jargon of economics, the marginal costs per unit of output tend towards zero and the returns to scale are high. This explains why tech entrepreneurs can get very rich very young.

Technological change has always been (27) _____. There was a polarization of income and wealth in the first wave of industrialization at the beginning of the 19^th century, and this gave rise to political and institutional change over the 100 years between 1850 and 1950: the spread of democracy, the emergence of trade unions; progressive taxation and the development of social safety nets. These helped create bigger markets for the consumer goods that were spawned by the second Industrial Revolution: TVs, radios, vacuum cleaners and the like. (28) _____ over the past four decades a political model that both facilitated the spread of technology and provided some protection against its disruptive consequences has come under attack. Welfare states have become less generous, levels of long-term unemployment are much higher, taxation has become less progressive, and politics has increasingly been dominated by those with the deepest pockets (29) _____ can lobby the loudest.

Điền vào số (27)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions .

Computer programmer David Jones earns £35,000 a year designing new computer games, yet he cannot find a bank prepared to let him have a cheque card. Instead, he has been told to wait another two years, until he is 18.

The 16-year-old works for a small firm in Liverpool, where the problem of most young people of his age is finding a job. David's firm releases two new games for the expanding home computer market each month. But David's biggest headache is what to do with his money.

Despite his salary, earned by inventing new programs within tight schedules, with bonus payments and profit-sharing, he cannot drive a car, take out a mortgage, or obtain credit cards.

He lives with his parents in their council house in Liverpool, where his father is a bus driver. His company has to pay £150 a month in taxi fares to get him the five miles to work and back every day because David cannot drive.

David got his job with the Liverpool-based company four months ago, a year after leaving school with six O-levels and working for a time in a computer shop. "I got the job because the people who run the firm knew I had already written some programs," he said.

"I suppose £35,000 sounds a lot but actually that's being pessimistic. I hope it will come to more than that this year." He spends some of his money on records and clothes, and gives his mother £20 a week. But most his spare time is spent working.

"Unfortunately, computing was not part of our studies at school," he said. "But 1 had been studying it in books and 'magazines for four years in my spare time. 1 knew what 1 wanted to do and never considered staying on at school. Most people in this business are fairly young, anyway."

David added: "I would like to earn a million and 1 suppose early retirement is a possibility. You never know when the market might disappear."

Why is David different from other young people at his age?

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

Jake, the boy who sat beside me in class, used to wear _____ shirt to school.

Tiến hành điện phân dung dịch chứa m gam hỗn hợp CuSO₄ và NaCl bằng dòng điện một chiều có cường độ 2A (điện cực trơ, có màng ngăn). Kết quả thí nghiệm được ghi trong bảng sau:

Giả sử hiệu suất điện phân 100%, các khí sinh ra không tan trong dung dịch. Giá trị của m là:

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.

        Instructors at American colleges and universities use many different teaching methods. Some instructors give assignments everyday. They grade homework. Students in their classes have to take many quizzes, a midterm exam, and a final test. Other instructors give only writing assignments. Some teachers always follow a course outline and usually use the text book. Others send students to the library for assignments.

        The atmosphere in some classrooms is very formal. Students call their instructors “Professor Smith,” “Mrs Jones,” and so on. Some teachers wear business clothes and give lectures. Other classrooms have an informal atmosphere. Students and teachers discuss their ideas. Instructors dress informally, and students call them by their first names. American teachers are not alike in their teaching styles.

        At most American colleges and universities, facilities for learning and recreation are available to students. Students can often use type-writers, tape recorders, video machines, and computers at libraries and learning centres. They can buy books, notebooks, and other things at campus stores. They can get advice on their problems from counselors and individual help with their classes from tutors. Students can relax and have fun on campus, too. Some schools have swimming pools and tennis courts. Most have snack bars and cafeterias.

What is the main idea of the first paragraph?

Read the following passage and mark the letter A, B, C, or D to indicate the correct word or phrase that best fits each the numbered blanks.

Setting up and running a car company was an expensive business and required a lot of workers. A company that makes its money out of a smart app requires less capital, doesn't have to pay (25) _____ storage or transport in the way that car companies do and (26) _____ virtually no extra costs as the number of users increases. In the jargon of economics, the marginal costs per unit of output tend towards zero and the returns to scale are high. This explains why tech entrepreneurs can get very rich very young.

Technological change has always been (27) _____. There was a polarization of income and wealth in the first wave of industrialization at the beginning of the 19^th century, and this gave rise to political and institutional change over the 100 years between 1850 and 1950: the spread of democracy, the emergence of trade unions; progressive taxation and the development of social safety nets. These helped create bigger markets for the consumer goods that were spawned by the second Industrial Revolution: TVs, radios, vacuum cleaners and the like. (28) _____ over the past four decades a political model that both facilitated the spread of technology and provided some protection against its disruptive consequences has come under attack. Welfare states have become less generous, levels of long-term unemployment are much higher, taxation has become less progressive, and politics has increasingly been dominated by those with the deepest pockets (29) _____ can lobby the loudest.

Điền vào số (26)

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

_____ broken several world records in swimming.

Hỗn hợp X gồm Al, Al₂O₃, K và K₂O (trong đó nguyên tố O chiếm 19,969% về khối lượng). Hòa tan hoàn toàn 32,05 gam hỗn hợp X vào nước thu được dung dịch Y và 6,16 lít H₂ (đktc). Cho từ từ dung dịch HCl vào dung dịch Y. Thấy đồ thị biểu diễn số mol kết tủa thu được với số mol HCl như sau:

Giá trị của x là

Ở điều kiện thường, kim loại nào sau đây không phản ứng với nước

X, Y là hai cacbohiđrat. X, Y đều không bị oxi hóa bởi AgNO₃/NH₃. Đốt cháy m gam X hoặc Y đều thu được cùng một lượng CO₂ và H₂O. X, Y lần lượt là: