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?

    _______________________________________________________________

2. The waste water pollutes the river. 

    _______________________________________________________________

3. You must learn the new words by heart. 

    _______________________________________________________________

4. We can't live if there is no air. 

    _______________________________________________________________

5. He has green fingers. 

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徐州自古以来是兵家必争之地，现代战争中就有以徐州为的中心两场战役是？