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The bus hit against a tree in the fog and ______to the deep valley，with ten passengers killed and twenty wounded.

    A. down did it roll                     B. down rolled it      

    C. it down rolled                           D. down it rolled

--Do you think you will give me a hand in time of trouble?

   --I’d like to do something for you ______ everything you’ve done for me.

    A. in exchange      B. in turn      C. in return for    D. in terms of

The continuous rain ______ the harvesting of the wheat crop by two months.

    A. set back        B. set off       C. set aside       D. set out

Babies’ health is much more likely to be affected if______ parent smokes．

    A. both             B. none        C. neither      D. either

______, I believe, and you will find Tom is very outgoing.

   A. Having a talk with the student   B. Given a talk with the student

   C. One talk with the student         D. If you have a talk with the student

I should very much like to have gone to the party, but ______.

   A. I'm not invited                   B. I won't be among the invited　

   C. they won't invite me              D. they didn't invite me

His play was popular and every time ______about it, he owed his success to the support of his friends.

   A. talking        B. talked         C. to talk          D. when talking

We would have called a taxi yesterday if Harold ______us a ride home.

   A. didn't offer  B. wouldn't offer  C. hasn't offered   D. hadn't offered

 It was foolish of you to take a taxi ______you could walk there in five minutes.

  A. where         B. as            C. How           D. when

Food supplies in the flood-stricken area ______. We must act immediately  before there’s nothing left.

  A. have run out                       B. are running out  

  C. have been run out                  D. are being run out