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20. Didn’t it ever ________to you that one day you wouldn’t be fired because of your carelessness?

   A. dream     B. occur     C. strike     D. happen

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19. In a sports team each player has a clear role, and there are few occasions ________members are confused or uncertain of their roles.

     A. why         B. where         C. when          D .in which

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18. If you are out to get up early and do exercises every morning, it will_____good health.

  A. get across       B. end up in     C. make for      D. contribute for

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17. They _____ on the program for almost one week before I joined them, and now we _____ it as no good results have come out.

  A. had been working; are still working

B. had worked; were still working

  C. have been working; have worked

D. have worked; are still working

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