49.The machines are made ______ at full speed.

a. work b. working c. to work d. to be worked

50.It is certain that men will never stop ______ new energy sources to power their growing industry.

a. finding b. to find c. having found d. found

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

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

a. having made b. having been made c. to have made d. to make

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

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

a. being completed b. completed completing d. have been completed

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

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

a. make b. making c. to making d. have made

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

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

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