{01}I tried to persuade him to give up the foolish idea, but in ________, and now he begins to regret.
A.vain
B.turn
C.return
D.case
解析:in vain意为“徒劳地”;in turn意为“依次,轮流”;in return意为“作为回报”;in case意为“万一,以防”。根据句意“我原来极力劝他放弃那个愚蠢的想法,他不听,现在他却开始后悔了”可知,答案为A。 本题选A。 {02}No matter what you do,you should put your _________into it.
A.mind
B.hours
C.brain
D.thought
解析:put one’s heart into sth.意思为“专心做某事。” 本题选B。 {03}In this experiment, the famous professor showed three different____ to the study of physics.
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