根据要求改写句子。
1. don’t, the, window, close (.)(连词成句)
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2. you, how, are, old (?) （连词成句）
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3. the, to, please, teacher, listen, the (.)（连词成句）
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4. My brother is in the library (对划线部分提问)
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5. This is a nice schoolbag. (改为一般疑问句，并作否定回答)
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