Directions: For each blank in the following passages there are four words or phrases marked.

A, B, C and D. Fill in each blank with the word or phrase that best fits the context.

(A)

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 51 begins in a little crack in the enamel (珐琅) covering of the tooth. This happens after germs and bits of food have 52 there. Then the decay slowly spreads inside the tooth. In the end, poison goes into the blood, and we may feel quite ill.

How can we keep our teeth 53 ? First, we ought to visit our dentist twice a year. He can fill the small hales in our teeth before they destroy the teeth. He can 54 our teeth to check that they are growing in the right way, 55 , many people wait until they have toothache before they see a dentist. Secondly, we should brush our teeth with a toothbrush and fluoride (氟化物) toothpaste at least 56 a day-once after breakfast and once before we go to bed. We can also use wooden toothpicks to 57 between our teeth after a meal. Thirdly, we should eat food that is 58 to our teeth and our body, milk, cheese, fish, brown bread, potatoes, re rice. raw vegetables and fresh fruit. Chocolate, sweets, biscuits and cakes are bad, especially 59 we eat them between meals. They are harmful because they 60 out teeth and cause decay.

51. A. destruction　　 B. decay 　C. fault　　 D. hurt

52. A. stored　　 B. collected　　 C. laid　　 D. piled

53. A. healthy　　 B. complete　　 C. effective　 D. painless

54. A. observe　　 B. skim　　 C. watch　　　 D. examine

55. A. Unexpectedly　　 B. Certainly small　　 C. Unfortunately　 D. Generally

56. A. once　　　 B. twice　　　 C. three times　　 D. four times

57. A. drill　　 B. dig　　　 C. clean　　 D. explore

58. A. delicious　　 B. valuable　 　　C. beneficial　　 D. meaningful

59. A. what　　 B. how　　 C. whether　　 D. when

60. A. stick to　　 B. attach to　　 C. fix on　　 D. keep to

50. It you 　　any problems when you arrive at the airport, give me a ring.

A. come up with　 B. set about　　 C. run into　 D. put aside

49. It is good for elderly people to be involved in community service.

A. honestly　　 B. patiently　　 C. eagerly　　　 D. actively

48. Although he has taken a lot of medicine, his health 　　poor.

A. proves　　 B. remains 　　C. maintains　　 D. continues

47. After much 　　, the shop owner agreed to cut down the price by 20%.

A. debating　　 B. talking　　 C. discussing　　 D. bargaining

46. It can’t be a(n) 　　that four jewelry stores were robbed in one night.

A. coincidence　　 B. accident　　 C. incident　　 D. chance

45. I saw Bob play the piano at John’s party and on that 　　he was simply brilliant.

A scene　　 B. circumstance　　 C. occasion　 D. situation

44. Please follow your supervisor’s instructions, or you’ll 　　him.

A. discourage　 B. offend　　 C. disturb　　 D. bother

43. For the sake of her daughter’s health, she decided to move to a warm 　　.

A. weather　　 B. temperature　　 C. season　　 D. climate

42. It seems difficult to 　　“hurt” from “injure” in meaning.

A. judge　　 B. tell　　 C. divide　　 D. separate