21. The flu is believed ________ by viruses that like to reproduce in the cells inside the human nose and throat.

A. cause                      B. being caused           C. to be caused             D. to have caused

22. The flowers ________ sweet in the botanic garden attract the visitors to the beauty of nature.

A. to smell                    B. smelling                  C. smelt                       D. to be smelt

23. The disc, digitally ________ in the studio, sounded fantastic at the party that night.

A. recorded                   B. recording                C. to be recorded          D. having recorded

24. Having been attacked by terrorists, ________ .

A. doctors came to their rescue                         B. the tall building collapsed

C. an emergency measure was taken                  D. warnings were given to tourists

25. Robert is said ________ abroad, but I don’t know what country he studied in.

A. to have studied        B. to study                    C. to be studying      D. to have been studying

26. The managers discussed the plan that they would like to see ________ the next year.

A. carried out              B. carrying out               C. carry out                 D. to carry out

27. I’ve worked with child before, so I know what ________ in my new job.

A. expected                 B. to expect                   C. to be expecting         D. expect

28. ________ such heavy pollution already, it may now be too late to clean up the river.

A. Having suffered       B. Suffering                   C. To suffer                 D. Suffered

29. Having a trip abroad is certainly good for the old couple, but it remains ________ whether they will enjoy it.

A. to see                     B. to be seen                  C. seeing                      D. seen

30. The research is so designed that once ________ nothing can be done to change it.

A. begins                    B. having begun              C. beginning                 D. begun

31. It is said that in Australia there is more land than the government knows ________.

A. it what to do with                                         B. what to do it with

C. what to do with it                                         D. to do what with it

32. A cook will be immediately fired if he is found ________ in the kitchen.

A. smoke                    B. smoking                    C. to smoke               D. smoked

33. I’m going to the supermarket this afternoon. Do you have anything ________ ?

A. to be buying            B. to buy                       C. for buying             D. bought

34. The pilot asked all the passengers on board to remain ________ as the plane was making a landing.

A. seat                        B. seating                     C. seated                     D. to be seating

35. Victor apologized for ________ to inform me of the change in the plan.

A. his being not able                                        B. him not to be able 

C. his not being able                                        D. him to be not able

36. Suddenly, a tall man driving a golden carriage ________ the girl and took her away, ________ into the woods.

A. seizing, disappeared                                    B. seized, disappeared

C. seizing, disappearing                                   D. seized, disappearing

【答案解析】

1. D. 因为Hellen要使自己讲的话被别人听到，所以要用过去分词作宾补，即：make herself heard；又因为make herself heard是shout的目的，所以用不定式。

2. C. form表示“出现、产生”，是不及物动词，又因为pictures与form是主动关系，故用现在分词作定语。

3. C. 因为insist后要么接that从句，要么接on sth. 或on doing sth. ，没有别的接法，所以选C。insist on doing坚持要做某事(from www.yygrammar.com)。

4. D. 因work abroad for twenty years发生在谓语动作(返回祖国)之前，所以用现在分词的完成式。

5. B. 因为现在分词作状语只能修饰谓语，而不定式作状语，既可修饰谓语又可修修饰形容词或副词，此处修饰形容词silly，要用不定式。又因为“没有锁车”发生在谓语之前，所以用完成式。

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