20.When ____ comes to repairing a machine, I have little knowledge of it.
A.that B.one C.this D.it
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
18.Creating world peace is a rather difficult goal, ____ calls for efforts of many generations.
A.one that B.one C.that D.it
17.Alone in a deserted house, he was so busy with his research work that he felt ____ but lonely.
A.nothing B.anything C.all D.everything
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