Chọn đáp án đúng16. Having healthy teeth is________ A. bad B. important C. interesting D. unimportant 17. When food and germs collect in a small crack, our teeth________ A. become hard B. send poison into the blood C. begin to decay D. make us feel quite ill 18. Good teeth help us ________ our food. A. have B. drink C. chew D. give 19. It is a good idea to eat ________. A. healthy food. B. unhealthy food. C. junk food D. fastfood 20. A lot of people visit the dentist only when_________. A. their teeth grow properly B. they have holes in their teeth C. they have toothache C. they have brush their teeth 21. We ought to clean our teeth________. A. After breakfast B. before breakfast C. before bedtime D. Both A &C 22. We shouldn’t eat a lot of ________ A. red rice B. fresh fruit C. fish D. chocolate 23. Eating chocolates, sweets, biscuits and cakes between meals is________to our teeth. A. harmful B. good C. nice D. necessary |