问题描述：
You can't sing in class and you can't make the classroom dirty ____
We must ______ all the new words after school
I think you so .It is very ____
But I think you should _____ yourself in your free time
We must ______ all the new words after school
I think you so .It is very ____
But I think you should _____ yourself in your free time
问题解答：
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