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81. When I was studying at Beijing University, I ____ take a walk along the lake every evening.

　 A. will　　　　　　　　　 　 B. would　　　　　　　 C. could　　　　　　　 D. shall

80. I can't understand why you all ____ think that I did it.

　 A. shall　　　　　　　　 　　 B. will　　　　　　　　 C. can　　　　　　　　 D. should

79. If you ____ change your mind, please let me know.

　 A. will　　　　　　　　　 　 B. need　　　　　　　　 C. should　　　　　　 D. ought to

78. I ____ think it would be better to try it again.

　 A. shall　　　　　　　　 　　 B. should　　　　　　　 　C. ought to　　　　　　 D. can

77.You ____ fail to pass the entrance examination if you don't study harder.

　 A. shall　　　　　　　　 　　 B. could　　　　　　　　 C. will　　　　　　 　D. should

76.It’s nearly seven o’clock.Jack_____be here at any moment.

　 A.must　 　　　　　　　　　B.need　 　　　　　　　C.should　 　　　　　

75.------Did you walk home by yourself last night?

　 ------Yes ,I did. But I guess I_____.

　 A.shouldn’t　 　　　　B.needn’t　 　　　　C.may not have 　　　　D.needn’t have

74.------Does Tom want to go to the film?

　 ------Yes,but he says_____tonight.

　 A.he’d not rather go　　 B.he’ll rather not go　 C.he won’t rather go　　 D.he’d rather not go

73.The flower is dead.I_____it more water.

　 A.will give　　 　　　B.must give　 　　　C.should have given　 　　　D.would have given

72.------Where were you this morning?I tried to call you.

　 ------I _____ to the library for a while.

　 A.tried to go　 　　　B.should go　　 　　C.must go　　 　　　　　D.had to go