41. Good teeth help us .............................. our food. A. be nice B. have good eyesight C. chew D. be important 42. 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 43. 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 brushed their teeth 44. We ought to clean our teeth …………………. A. after breakfast B. before breakfast C. before bedtime D. both B &C 45. We shouldn’t eat a lot of …………………. A. red rice B. fresh fruit C. fish D. Chocolate