86.Our eating habits have changed, ____ has our way of life.

　　 A. as　　　　　　 B. which　　　　　　 C. like　　　　 D. much

85.They advised her _______ marrying quickly.

　　 A. not　　　 　　　B. not to　　　　　 C. of　　　　　 D. against

84.Such things ______.

　　 A. ought not to do　　　　　　　　　　 B. ought not to be done

　　 C. oughtn't be done　　　　　　　　　 D. ought to done

83.-- ______ write to say thank you?　 --Yes, I think you ought (to).

　　 A. Ought I　　　　 B. Ought to I　　　 C. Ought I to　 D. Should I

82.The ____ of the heart is to pump blood through the body.

　　 A. energy　　　　 B. function　　　　 C. base　　　　 D. product

81.Too rich a _______ is not good for you since you are so fat.

　　 A. habit　　　　　 B. food　　　　　　 C. fat　　　　 D. diet

80. Six o'clock will be too late to go, you ____stay at home.

　　 A. have better　　 B. had better　　　 C. may well　　 D. would rather

79.Oh, Jane, you’ve broken another glass. You ought ______ when you washed it.

　　　 A. be careful　　　　　　　　　　　　 B. to careful

　　　 C. to be careful　　　　　　　　　　 D. to have been careful

78.When driving, we _____ obey the traffic laws thoroughly and absolutely.

　　　 A. should　　　 　B. need　　　　　　 C. ought　　　 D. must

77.To keep the road as pleasant as possible, most of these trees _______ when the road is widened.

A. preserves　　　　　　　　　　　　　 B. must preserve　　

C. should be preserved　　　　　　　　 D. ought to have preserved