Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions
6. A. chew our food
=> Dẫn chứng: It is very important to have healthy teeth. Good teeth help us to chew our food.
7. B. begin to decay
=> Dẫn chứng: 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
8. C. They begin to have toothache
=> Dẫn chứng: Unfortunately, many people wait until they have toothache before they see a dentist
9. D. sweet things
=>Dẫn chứng: Chocolate, 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.
10. D. How to keep your teeth healthy
