摘要： If the factory keeps on pouring waste water into the river, the river will become very .
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根据句意，在每个句子的空白处填入一个适当的词，使句子意思完整，语法正确。
1. If the factory keeps on pouring waste water into the river, the river will become very __________.
2. The famous writer is writing a book __________ the environment.
3. We should do something to improve our environment, not to __________ it.
4. There will be a big party at Ann’s house. Would you like to __________ us?
5. I’m __________ of dogs, so I never come near a dog.
6. I joined the Party the day before yesterday, so I’m a __________ of the Party now.
7. Don’t __________ __________ the trees, or the wind will blow the earth away.
8. She has to stay at home, __________ she?
9. We have been __________ Canada four times.
10. It’s not polite to spit in a __________ place.
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