A. Little they realize

    B. They little do realize

    C. Little realize do they

    D. Little do they realize

    12. They will go home for winter vacation as soon as they_______ their exams.

    A. have finished

    B. finish

    C. will finish

    D. will have finished

    13. Without your help， we_______ so much.

    A. didn't achieve

    B. would not have achieved

    C. will not achieve

    D. don't achieve

    14. They sent us their statement，_______ to get our support.

    A. hoped

    B. to hope

    C. hoping

    D. having hoped

    15. The time will  _______ man can fly to outer space freely.

    A. that

    B. when

    C. in that

    D. which

    16. My wallet is nowhere to be found. I _______ when I was on the bus.

    A. must have dropped it

    B. must drop it

    C. should have dropped it

    D. ought to have dropped it

    17. Arriving at the bus stop，_______ waiting there.

    A. he found a lot of people

    B. a lot of people were

    C. he found a lot of people's

    D. people were found

    18. “She must be in the dormitory now.” “No，she _______ be there. I saw her in the classroom a minute ago. ”

    A. mustn't

    B. couldn't

    C. can't have

    D. wouldn't

    19. _______ you were busy，I wouldn't have bothered you with my questions.

    A. If I realized

    B. Had I realized

    C. Did I have realized that

    D. As I realized

    20. Tom said that he wouldn't mind _______.

    A. to wait for us

    B. waiting for us

    C. wait for us

    D. for waiting us

    参考答案：

    11—15 DBBCB 16—20 AABBB