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.