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

71.------I didn’t see him yesterday.

　 ------Oh,but you______.

　 A.ought to　 　　　　B.should have　　 　　’t have　 　　　　　D.may have　　

69.I____like to become a pianist some day.

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

70 He_____there now,but I am not sure.

　 A.maybe　　 　　　　B.may be　 　　　C.may have been　　 　　D.might have been