36.　　 The whole building _____ burned down, but the heavy rain _____.

A. might have; would help

B. could have been; helped

C. must have; helped

D. should have been; was helping

35.　　 Messages ______ be changed from sound into electricity before they ______ be sent by radio.

A. must; will　 B. have to; can　　　 C. can; must　　 D. need; may

34.　　 He _____ his parents that he has failed in the exam.

A. dares not tell　 B. dares not telling　　　 C. dare not tell　　 D. dares not to tell

33.　　 —The poor people lived near the highway.

—_____ very noisy.

A. It must have been　　　 B. They must be　　 C. That might be　　　 D. There must be

32.　　 As is natural, a man as old as he ______ be very forgetful.

A. can　 B. must　 C. should　 D. would

31.　　 You _____ pay too much attention to your reading skill, as it is so important.

A. cannot　 B. should　 C. must　 D. needn’t

30.　　 I _____ have written to him because he phoned me shortly afterwards.

A. ought to　　　 B. must　　　 C. couldn’t　　　 D. needn’t

29.　　 Sir, you ______ be sitting in this waiting room. It is for women and children only.

A. oughtn’t to 　 B. can’t　　　 　 C. won’t　　 D. needn’t

28.　　 He hurt his leg climbing the mountain; otherwise, he _____ the meeting.

A. will attend　　　　 B. had attended　　　 C. would have attended　　　　　　 D. would attend

27.　　 My sister met him at the Grand Theatre yesterday afternoon, so he ________ your lecture.

A. couldn’t have attended　　　　　　　　　　 B. needn’t have attended

C. mustn’t have attended　　　　　　　　　　　　　 D. shouldn’t have attended