60. 　 Do you consider better _______ ?

A. not doing it again　　　　 B. not do it again

C. not having done it again　　 D. not to do it again

59. 　 I had intended ______ him while he was living at Aberdeen.

A. visiting　　 B. visit　　 C. to have visited　　 D. having visited

58. 　 I would like ______ that I don’t have a very high opinion of you.

A. to have you know　　　 B. have you know

C. to have your known　　 D. having you know

57. 　 I can’t understand ______ a decision until it is too late.

A. him to postpone to make　　　 B. his postponing to make

C. him to postponing making　　　 D. his postponing making

56. 　 All of us are looking forward to ______ a trip to the Ming Tombs.

A. make　　 B. making　　 C. to making　　 D. have made

55. 　 There are plans ______ a number of atomic power station in this regions.

A. to build　　 B. to be built　　 C. building　　 D. being built

54. 　 The rocket will weigh about 200 tons when ______.

A. being completed　　 B. completed　　 completing　 　D. have been completed

53. 　 Without the sun’s light ______ the earth’s surface, it would be so cold that life could not exist on the earth.

A. warms　　 B. warmed　　 C. warming　　 D. to warm

52. 　 Professor Smith is said ______ another important discovery in chemistry.

A. having made　　 B. having been made　　 C. to have made　　 D. to make

51. 　 It is really quite extraordinary that we should have been at the same college without ______ before.

A. met　　 B. being met　　 C. having met　　 D. having been met