a. be oiled b. must be oiled c. is oiled d. will oil

21.His English teacher recommends that he ______ a regular degree program.

a. begins b. begin c. will begin d. is beginning

22.We prefer that the plan ______ before being put into execution.

a.is fully discussed b. must be fully discussed

c.be fully discussed d. will be fully discussed

23.What do you think of his proposal that improvements ______ in the old type of vacuum cleaner?

a. be made b. will be made c. would be made d. will have to be made

24.The doctor’s advice is that the patient ______ about his real physical condition.

a.be not told b. not be told c. will not be told d. must not be told

25.______,we could not have finished the work on time.

a.If they do not help us b. Was it not for their help

c.Should they offer to help us d. But for their help

26.If we had been more careful, we ______ much better results now.

a. got b. had got c. would be getting d. would have got

27.Henry ______ a rich man today if he had been more frugal in the past.

a. would be b. is c. will be d. was

28.They thought it desirable that an armed guard ______ in readiness.

a. stands b. stand c. stood d. would stand

29.All science students, ______,should have a good foundation in basic sciences.

a.whether they are future physicists and chemists

b.they are future physicists of chemists

c.they should be future physicists of chemists

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