20. My parents never remember my telephone number, and they always ______ look it up.

　 A. should　　 　　　B. can　 　　　　C. have to　 　　　　 D. must

19. The Smiths went to the country for the weekend as they ______ to the office.

　 A. needn’t have gone　 B. mustn’t go　　 C. may not go　 　　 　D. didn’t have to go

18. I ______ her, but I never could.

　 A. ought to help　　 B. must help　　 　C. must have helped　　 D. ought to have helped

17. I promised to get there before 5 o’clock, but now the traffic is still so heavy. They _____ for me impatiently.

　 A. may wait　　　 　B. must be waiting　 　C. could wait 　 　　　D. ought to wait

16. I lived with my sister this summer and didn’t have to pay rent. So I _____ save most of my salary.

　 A. was able to　　　 B. would 　　　　　C. could　　　 　　 　D. should

15.　　 His restaurant ought to be full of people.

His restaurant ought to be ________ _________ people.

14.　　 He often lies, so no one believes him.

He often _______ _______ _______, so no one believe him.

13.　　 Johnson lives a hard life, for he owes(欠) a lot of money.

Johnson lives a hard life, for he is _______ ______.

12.　　 If you cheat in the exam, you will be punished(惩罚) for it.

If you cheat in the exam, you will never _______ _______ _______ it.

每空填一词，使该句与所给句子的意思相同

11.　　 Wang Bin, you should surf the Internet for more information.

Wang Bin, you _______ _______ surf the Internet for more information.