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
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
33. The girl seldom, if _____, turned to her brother for protection.
A. never B. ever C. always D. then
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