21. The discovery of new evidence led to________ .

　　A. the thief having caught B. catch the thief

　　C. the thief being caught D. the thief to be caught

　　22. I couldn’t find my key to the car when________home.

　　A. leaving B. to leave C. left D. having left

　　23. Though________money, his parents managed to send him to university.

　　A. lacked B. lacking of C. lacking D. lacked in

　　24.________to sunlight for too much time will do harm to one’s skin.

　　A. Exposed B. Having exposed

　　C. Being exposed D. After being exposed

　　25. I really appreciate________to relax with you on this nice island.

　　A. to have had time B. having time C. to have time D. to having time

　　26. One learns a language by making mistakes and________them.

　　A. correct B. correcting C. corrects D. to correct

　　27. Mr Reed made up his mind to devote all he had to________some schools for poor children.

　　A. set up B. setting up C. have set up D. having set up

　　28. Sometimes new ideas have to be tested many times before________ .

　　A. accept fully B. fully accepting C. fully been accepted D. being fully accepted

　　29.________this, you should have no trouble with the difficult work.

　　A. Knowing B. If you are knowing C. From knowing D. If you had known

　　30. Never________faith in himself, the scientist went on with his research.

　　A. losing B. to lose C. lose D. to be lost

　　31.________made her very happy.

　　A. Her parents will come B. Her parents to come

　　C. Her parents came D. Her parents’ coming

　　32. The________girl was last seen________near the park.

　　A. missing; playing B. missing; play

　　C. missed; play D. missed; to play

　　33. Tony was very unhappy for________to the party.

　　A. having not been invited B. not having invited

　　C. having not invited D. not having been invited

　　34. When he was young, he used to go there and watch________ .

　　A. to repair bikes B. bikes to be repaired

　　C. bikes being repaired D. repairing bikes

　　35. After the party the children were allowed to finish off the________sandwiches and cakes.

　　A. remaining B. rest C. leaving D. remained

　　36. A policeman reported________an old lady risk________very fast on the highway.

　　A. to see; driving B. seeing; driving 　C. to see; drive D. to see; driven

　　37. I really appreciate________to help me, but I am sure that I can manage by myself.

　　A. your offering B. that you offer C. you to offer D. that you are offering

　　38. What worried the boy most was________to go to school.

　　A. his not allowing B. his not being allowed

　　C. his being not allowed D. having not been allowed

　　39. Slowly she opened the letter,________ .

　　A. her hands slightly trembling B. trembling her hands slightly

　　C. her hands trembled slightly D. slightly her hands were trembled

　　40. —What do you think of the book?

　　—Oh, excellent. It’s worth________a second time.

　　A. to read B. to be read C. reading D. being read