A. sure

    B. right

    C. exact

    D. certain

    22. You will never guess whom I _________ on the street yesterday.

    A. ran over

    B. ran out of

    C. ran into

    D. ran up to

    23. I don't think it is any use _________ this matter any further.

    A. discussing

    B. to discuss

    C. to discussing

    D. to be discussed

    24. In short，_________ he lives，a man belongs to some society.

    A. whatever

    B. whenever

    C. whichever

    D. wherever

    25. Judging from his manners at the party，he doesn't seem _________ much education.

    A. to receive

    B. to be receiving

    C. to have received

    D. to have been received

    26. Our children and grandchildren will _________ if we don't look after our pla.

    A. endure

    B. suffer

    C. tolerate D. bear

    27. The news of the air crash is not yet _________ by the government.

    A. mitted

    B. confirmed

    C. considered

    D. concerned

    28. You ought to know better than _________ yourself in unnecessary expense

    A. to involve

    B. involve

    C. involving

    D. involved

    29. She walked across the meeting room _________ every one looking at her.

    A. with

    B. as

    C. while

    D. when

    30. No sooner had we sat down _________ we found it was time to go.

    A. than

    B. when

    C. as

    D. while

    参考答案：

    21—25 DCADC 26—30 BBAAA