28. I apologize if I ____ you, but I assure you it was unintentional(无意的).

A. offend(冒犯)　　　 B. had offended　　 C. should have offended　 D. might have offended.

27. As it turned out to be a small house party, we ____ so formally(正式地).

A. needn't dress up　　　 B. did not need have dressed up　

C. did not need dress up　　 D. needn't have dressed up

26. I worked so late in the office last night that I hardly had time ____ the last bus.

A. to have caught　　 B. to catch　　 C. catching　　 D. having caught

25. I can't _____ what has happened to the vegetables, for they were freshly picked this morning.

A. figure out　　 B. draw out　　 C. look out　　 D. work out.

24. When workers are organized in trade unions, employers find it hard to lay them _____.

A. off　　 B. aside　　 C. out　　 D. down

23. I would have gone to visit him in the hospital had it been at all possible, but I ____ fully occupied the whole of last week.

A. were　　 B. had been　　 C. have been　　 D. was

22. The Social Security Retirement Program is made up of two trust funds(基金,资金), ____could go penniless by next year.

A. the larger one　　 B. the larger of which　　 C. the largest one　　 D. the largest of which

21. Christmas is a Christian holy day usually celebrated on December 25th ____ the birth of Jesus Christ.

A. in accordance with　　 B. in terms of　　 C. in favor of　　 D. in honor of

20. She wondered if she could have the opportunity to spend ____ here so that she could learn more about the city.

A. sometimes　　 　B. some time　　 C. sometime　　 D. some times.

19. I was speaking to Ann on the phone when suddenly we were _____.

A. hung up　　 B. hung back　　 C. cut down　　 D. cut off