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【題目】“C your mind on your textbook, Jack! You've wasted too much time daydreaming!” the teacher said angrily in class.

【答案】Concentrate
【解析】句意：專心于課本，杰克！你浪費了太多時間做白日夢。concentrate one's mind on固定短語，“專心于......”，可知答案為Concentrate。祈使句，注意大寫開頭。

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