13. “I rang the door bell, but no one answered.”

　 “Oh, he _____ at that time.”

　 A.should be sleeping　　　　 B.must have slept

　 C.must have been sleeping　　 D.could be sleeping

12.Our holidays were spoiled by the weather, we might just as well _____ at home.

　 A. to stay　　 B. stay　　 C. have stayed　　 D. staying

11. As he was not interrupted, he _____ the painting by _____8 o’clock in the evening.

　 A.could finish　 B.was able to finish　 finish　 D.is sure to finish

10. I showed him my new dress but I _____ tell him how much it cost.

　 A. dared not to　 B.dared not　 C.does not dare to　 D.dares not

9. You _____ all the way to meet me here. I know this place pretty well.

　 A.don’t need to come　　　　　 B.needn’t come

　 C.didn’t need to come　　　　　 D.needn’t have come

8.She _____ the examination again since she had already passed it.

　 A.needn’t have taken　　　　　 B. needn’t take

　 C.doesn’t need to take　　　　　 D.didn’t need to take

7. Jack _____ yet, otherwise he would have telephoned me.

　 A.mustn’t have arrived　　　　 B.shouldn’t have arrived

　’t have arrived　　　　　 D.needn’t have arrived

6. A lot of people complained that their forengn tour _____ better organized.

　 A.could have been　 B.may have been　 C.had been　 D.might be

5. We have spent more time than expected. We _____ the wrong road.

　 A. can take　　 B.should be　　 C.must take　　 D.must be taking

4.There is a lot of smoke coming out of the building there. It _____ be a fire, most probably.

　 A.has to　　 B. ought to　　 C.is going to　　 　D. will