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20. When ____ comes to repairing a machine, I have little knowledge of it.

  A. that         B. one         C. this         D. it

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19. Try to ____ at least half an hour each day for learning new vocabulary, and you’ll know more words.

  A. set aside          B. take up          C. put away        D. turn out

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18. Creating world peace is a rather difficult goal, ____ calls for efforts of many generations.

  A. one that               B. one         C. that        D. it

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