21. They set out ______ for the ______ boy.
A. searching; losing B. searching; lost
C. to search; lost D. to search; missed
22. ______ her mother had come, her face lit up.
A. Hearing B. Having heard
C. When hearing D. When she heard
23. They arrived at their university very late, ______ the gate closely shut.
A. found B. to find C. find D. finding
24. ----Do you have anything more ______, sir
----No. You can have a rest or do something else.
A. typing B. to be typed C. typed D. to type
25. The manager promised to keep me ______ of how our business was going on.
A. to be informed B. on informing C. informed D. informing
26. With a lot of difficult problems ______, the manager felt worried all the time.
A. to settle B. settling C. settled D. being settled
27. Will those ______ the children from abroad come to the headmaster's office
A. teaching B. teach C. who teaches D. who teaching
28. After ______ for the job, you will be required to take a language test.
A. being interviewed B. interviewed
C. interviewing D. having interviewed
29. They apologized for ______ to attend the meeting.
A. their not being able B. their being not able
C. them not able D. them being able not
30. They would not allow him ______ across the enemy line.
A. to risk going B. risking to go C. for risk to go D. risk going
31. ______ to nuclear radiation, even for a short time, may produce variants（变异体） of genes in human bodies.
A. Being exposed B. Having exposed
C. Exposed D. After being exposed
32. China became the 143rd member of the World Trade Organization on December 11, 2001, thus ______ its 15-year wish to join the global trade body.
A. having realized B. realized C. realizing D. to realize
33. Tom looked at Jenny, tears ______ his eyes, and shouted out the words ______ in his heart for years.
A. filling; having hidden B. filled; hidden
C. filling; hidden D. filled; hiding
34. They apologized for ______ to attend the meeting.
A. their not being able B. their being not able
C. them not able D. them being able not
35. Which will you enjoy ______ your vacation, traveling abroad or working in the countryside
A. to spend B. spend C. spending D. spent
36. ----Will you please tell us how you can seize the robbers
----I will spend a whole week ______ in your room to wait for their coming.
A. locking B. to lock C. locked D. being locked
37. I regret ______ you that they are unable to come to your wedding tomorrow.
A. informing B. having informed
C. to have been informed D. to inform
38. He wondered if he could slip out of the lecture hall without anyone ______.
A. noticing B. noticed C. to notice D. being noticed
39. After ______ for the job, you will be required to take a language test.
A. being interviewed B. interviewed
C. interviewing D. having interviewed
40. He spoke in such a high voice ______ out in the street.
A. as to be heard B. to be heard C. as to hear D. to hear
41. As early as 1647 Ohio made a decision that free, tax-supported schools must be set up in every town ______ 50 households or more.
A. having B. to have C. to have had D. having had
42. The building project ______ next year is, I think, not easy ______ in time.
A. being carried out; to complete B. carried out; to be completed
C. to be carried out; to complete D. to be carried out; to be completed