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35. It is difficult for any of us to eat better, exercise more and sleep enough _________ we know we should.

A. despite         B. even though          C. as if            D. unless

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34. Hardly _______________ when we were told to stop.

  A. did we begin      B. had we begun   

C. were we beginning    D. were we to begin

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33. The girl seldom, if _____, turned to her brother for protection.

   A. never     B. ever      C. always       D. then

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