It is very important to have healthy teeth. Good teeth help us to chew our food. They also help us to look nice. How does a tooth go bad ? The decay begins in a little crack in the enamel covering of the tooth. This happens after germs and bits of food have collected there, then the decay slowly spreads inside the tooth. Eventually, poison goes into the blood, and we may feel quite ill. How can we keep our teeth healthy? Firstly, we ought to visit our dentist twice a year. He can fill the small holes in our teeth before they destroy the teeth. He can examine our teeth to check that they are growing in the right way. Unfortunately, many people wait until they have toothache before they see a dentist. Secondly, we should brush our teeth with a toothbrush and fluoride toothpaste at least twice a day - once after breakfast and once before we go to bed. We can also use wooden toothpicks to clean between our teeth after a meal. Thirdly, we should eat food that is good for our teeth and our body: milk, cheese, fish, brown bread, potatoes, red rice, raw vegetables and fresh fruit. Chocolates, sweets, biscuits and cakes are bad, especially when we eat them between meals. They are harmful because they stick to our teeth and cause decay. Câu 40: Good teeth mainly help us to _____. A. look nice B. look important C. have good eyesight D. chew our food Câu 41: When food and germs collect in a small crack, our teeth _____. A. send poison into the blood B. become hard C. begin to decay D. make us feel quite ill Câu 42: A lot of people do not visit a dentist until _____. A. they have holes in their teeth B. they have brushed their teeth C. their teeth grow properly D. they have toothache Câu 43: What may be most harmful to our teeth? A. raw vegetables B. sweet things C. fresh fruit D. red rice Câu 44: The best title for the passage would be _____. A. “How to clean our teeth” B. “How to make our teeth nicer” C. “How to keep our teeth healthy” D. “How to keep our teeth ever white” Câu 45: The word “unfortunately” is closet in meaning to A. However B. Because C. Therefore D. Although Câu 46: How many steps can we protect our teeth heath? A. 5 B. 2 C. 3 D. 4 Câu 47: Which of the following sentences is true ? A. Sweet food is good for our teeth. B. We should use wooden toothpicks to clean between our teeth after a meal C. Poison can spread inside the tooth but can’t go into blood. D. Decay happens before germs and bits of food have collected our teeth. Chọn đáp án đúng: Câu 48: “I’m sorry I have to leave so early,” he said. A. He apologized that he has to leave early. B. He apologized to have left early. C. He apologized for having to leave early D. He apologized to have to leave early Câu 49: We didn’t recognize him until he came into the light. A. It was not until we didn’t recognize him that he came into the light. B. It was not until he came into the light that we recognized him. C. It was not until we recognized him that he came into the light. D. It was not until he came into the light that we didn’t recognize him. Câu 50: He played some games and then went to bed. A. After he had played some games, he went to bed. B. While he was playing some games, he was going to bed. C. He went to bed before having played some games. D. Playing some games, and then he had gone to bed.