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1. As economic systems have developed in our country, water pollution has been going____ ____ ____ ____. (变得更坏)

2. Secondly, we should do our best to ___ ___ _____ _____ ___ ____.(平衡水资源和工业发展)

3. Don’t ___ ____ ___ ____behind his or her back. (说别人坏话)

4. You should always____ ____ _____ that we are in a big family. (记住)

5. So we all like to attend her class though she_______ ______(缺乏经验).

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