根据自己的理解，用已学过的英语解释下列句子。
要求：对划线部分做重点解释，写出的句子必须是对原句的全句的解释，
必须是完整的句子。
1. What's your address?
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2. The waste water pollutes the river.
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3. You must learn the new words by heart.
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4. We can't live if there is no air.
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5. He has green fingers.
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