题目内容
In order to keep healthy, when we wash our hands, we should ______ them at least for 15 seconds.
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I have something urgent to deal with; please be ______, saying what you want to say in as few words as possible.
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The monitor ______ the entire class to show their gratitude to the warm-hearted people who had helped them a lot.
The lazy students seldom listened to the teacher in class; ______, he failed in the final examination.
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