22.I ______ swimming in the river and I always _____ to swim when I can.

a.am liking/have gone b. am being liked/am going

c.like/go d. have liked/have been going

23.We have sometimes accidents on this line, but no accidents ______ since last winter.

a. occur b. have occurred c. have been occurring d. are occurring

24.He _____ on this essay for twenty minutes but he _____ only a hundred words.

a.has been working/has written b. is working/writes

b.has worked/has been writing d. works/is writing

25.Elections _______ every four years and Congress meets once a year.

a. are taken place b. are to be taken place c. took place d. take place

26.______ careless, or you will make mistakes.

a.Be not b. Not be c. Don’t d. Don’t be

27.The No.8 bus ______ to Chengdu college of Geology, and not to Sichuan University.

a.are gone b. is being gone c. goes d. are going

28.Oil, exported from Iran to Europe, _____ by tankers.

a.used to be transported/have been built up

b.used to being transported/have built up

c.was used to be transported/had been built up

d.was used to being transported/will be built up

29.If it ______,the match will be postponed.

a.has been rained b. does rain c. rains d. is rained

30.As soon as I ______ the tools, I shall begin with the work.

a.have b. am having c. have been having d. have been had

31.Once you ______ the knack of it, you will have no further difficulty.

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