A. source

    B. foundation

    C. origin

    D. basis

    12. Anne asked Tom ____the key.

    A. when he left

    B. where he had left

    C. how had he left

    D. why did he leave

    13. The customer accused the cook____ using canned potatoes.

    A. for

    B. with

    C. of

    D. against

    14. ____ is one of good properties of this metal.

    A. Light in weight

    B. Having been light in weight

    C. Be light in weight

    D. Being light in weight

    15. ——That car must have cost a lot of money.

    ——Oh，no，____.

    A. it mustn't

    B. it hasn't

    C. it doesn't

    D. it didn't

    16. He gave no opinion about the matter because he didn't want to risk ____in it.

    A. to involve

    B. being involved

    C. to be involved

    D. involving

    17. Don't fet to post the letter for me，____？

    A. do you

    B. will you

    C. are you

    D. can you

    18. If you____ that night，you might have been too late to get your ticket.

    A. didn't hurry

    B. hadn't hurried

    C. wouldn't hurry

    D. hadn't to hurry

    19. We must recover the stolen goods at all ____.

    A. accounts

    B. conditions

    C. payments

    D. costs

    20. There is no one here who can ____the problem.

    A. see off

    B. treat

    C. deal with

    D. set up

    参考答案：

    11—15 ABCDD 16—20 BBBDC