49. Most insurance agents would rather you _____ anything about collecting claims until they investigate the situation. A. do B. don’t C. didn’t D. didn’t do 50. Although most adopted persons want the right to know who their natural parents are, some who have found them wish that they _____ the experience of meeting. A. hadn’t B. didn’t have had C. hadn’t had D. hadn’t have 51. Without electronic computers, much of today’s advanced technology _____ . A. will not have been achieved B. have not been achieved C. would not have been achieved D. had not been achieved 52. He told her to return the book in time so that others _____ a chance to read it . A. may have B. will have C. would have D. might have 53. It is time that the government measures _____ to protect the rare birds and animals.

A. takes B. took C. has taken D. taking 54、-The research on the new bird flu virus vaccine is challenging and demanding. Who do you think can do the job?   -____ my students have a try?   A. Shall   B. Must   C. Will   D. May 55、-This wall of air is an effective answer to the problem and it ____ work.    -But it is a question to put such a wall of air around the statue.    A. may   B. must   C. should   D. could 56、-You didn’t wait for Mr. Black last night, did you?    -No, but we ____. He didn’t return home at all.    A. couldn’t have    B. needn’t have    C. didn’t need to   D. should wait have 57、-Can I pay the bill by check?    -Sorry, sir. But it is the management rule of our hotel that payment ____ be made in cash.    A. shall   B. need   C. will   D. can58、I ____ you, but I didn’t think you would listen to me.    A. could have told   B. must have told    C. should tell     D. might rell

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