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.

The cause of tooth decay is acid, which is produced by bacteria in the mouth. The acid removes minerals from tooth enamel, allowing tooth decay to begin; the saliva in your mouth encourages remineralization and neutralizes the acid. The rate at which bacteria in the mouth produce acid depends on the amount of plaque on the teeth, the composition of the microbial flora, and whether the bacteria of the plaque have been "primed" by frequent exposure to sugar. To keep your teeth healthy, a regular dental hygiene program should be followed.Removing plaque with a toothbrush and dental floss temporarily reduces the numbers of bacteria in the mouth and thus reduces tooth decay. It also makes the surfaces of the teeth more accessible, enabling saliva to neutralize acid and remineralize lesions. If fluoride is present in drinking water when teeth are forming, some fluoride is incorporated into the enamel of the teeth, making them more resistant to attack by acid. Fluoride toothpaste seems to act in another way, by promoting the remineralization of early carious lesions.In addition to a regular dental hygiene program, a good way to keep your teeth healthy is to reduce your intake of sweet food. The least cavity-causing way to eat sweets is to have them with meals and not between. The number of times you eat sweets rather than the total amount determines how much harmful acid the bacteria in your saliva produce. But the amount of sweets influences the quality of your saliva. Avoid, if you can, sticky sweets that stay in your mouth a long time. Also try to brush and floss your teeth after eating sugary foods. Even rinsing your mouth with water is effective.Whenever possible, eat foods with fiber, such as raw carrot sticks, apples, celery sticks, etc., that scrape off plaque, acting as a toothbrush. Cavities can be greatly reduced if these rules are followed when eating sweets.

What does this passage mainly discuss?

He looks very aggressive and threatening and so his soft, gentle voice is rather......

If you still want to maintain this relationship, you ____ behave improperly like that.

Whenever problems come up, we discuss frankly and find _______quickly.

Mark the letter A, B, C, or D on your answer sheet to show the underlined part that needs correction

He was in a great hurry and had no time to think it over. Otherwise, he had found another way out.

In case you’ve suffered from the injury, you __________ see the doctor today.

Give a suitable preposition:

In the UK, poor air quality is responsible _______ some 40,000 deaths each year.

Timmy has become confident as a result of his success.

The only thing that kept us out of prison was the way he spoke the local dialect.

⇒ But for his command …

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phases that best fits each of the numbered blanks

Women nowadays have more advantages than those in the past. For example, our great grandmothers were not allowed to go to school or to work to earn their own living. (1) ______, they had to depend on their husbands financially. Modern women, on the contrary, can get good education, have their own careers, and (2) ______ their interests. They can even take good positions in politics if they are competent (3) ______ it. However, women living in our modern society have their (4) ______ too. Today women work harder than their great grandmothers so that they can gain the (5) ______ between working life and family life.

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

If parents bring up a child with the sole aim of turning the child into a genius, they will cause a disaster. According to several leading educational psychologists, this is one of the biggest mistakes which ambitious parents make. Generally, the child will be only too aware of what his parents expect, and will fail. Unrealistic parental expectations can cause great damage to children. However, if parents are not too unrealistic about what they expect their children to do, but are ambitious in a sensible way, the child may succeed in doing very well – especially if the parents are very supportive of their child. Michael Collins is very lucky. He is crazy about music, and his parents help him a lot by taking him to concerts and arranging private piano and violin lessons for him. They even drive him 50 kilometers twice a week for violin lessons. Michael’s mother knows very little about music, but his father plays the trumpet in a large orchestra. However, he never makes Michael enter music competitions if he is unwilling. Winston Smith, Michael’s friend, however, is not so lucky. Both his parents are successful musicians, and they set too high a standard for Winston. They want their son to be as successful as they are and so they enter him for every piano competition held. They are very unhappy when he does not win. Winston is always afraid that he will disappoint his parents and now he always seems quiet and unhappy.

Indicate the underlined part that needs correction:

I think a good health is important, and so is education while money, to some extent, is not.

We are having ________ terrible weather which is quite strange. Usually ______ weather in UK is not this bad.

In 1999, the king's Chaipattana Aerator obtained Thai ____ for his rain-making techniques.

Closure of schools took place _____ falling numbers of pupils.