A. My mother wanted to know what my trouble was.
B. My mother asked what my trouble is.
C. My mother wanted to know what trouble is.
D. My mother asked me what was my trouble.
Đáp án đúng là: A
Giải thích: Vì câu gốc là câu hỏi có từ để hỏi nên chuyển sang câu gián tiếp phải đảo vị trí của động từ to be. Động từ to be cũng cần chia thì quá khứ đơn để phù hợp với động từ asked/wanted
Dịch: “Vấn đề của con là gì?” - mẹ tôi hỏi ->> Mẹ tôi muốn biết vấn đề của tôi là gì
In a few years’ time, our houses will be _________ by solar energy.
These (A) televisions are all too expensive (B) for we (C) to buy at this time (D).
Choose the best option A, B, C or D to complete the sentence:
Remember to turn off the lights before leaving _________.
Choose the, word or phrase (A, B, C or D) that best fits the blank space in the following passage:
Are you looking for a cheap, clean, effective (28) _________ of power that doesn’t cause pollution or waste natural resources? Look no further than solar energy (29) _________ our Sun.
This power could be provided by the Sun. One percent of the solar energy that reaches the Earth is enough to provide power for the (30) _________ population.
Many countries are already using solar energy. Solar panels are placed on the roofs of a house and the Sun’s energy is used (31) _________ water. The energy can be stored for a number of days; so on (32) _________ days you can use solar energy, too.
Choose the word whose underlined part is pronounced differently from that of the other words:
The cost of living in Vietnam is low compared _________ Singapore.
Choose the best sentence:
“Don’t stay up too late, my son”, he said.