B. should

　　C. must

　　D. needn’t

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

　　A. can

　　B. must

　　C. should

　　D. would

　　—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

　　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

　　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

　　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

　　—Many people in England love to give advice on weather reporting.

　　—Yes, but I think the weather office’s computers _____ be more accurate.

　　A. can

　　B. must

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