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用括号内所给动词的适当形式填空。 1. More trees and flowers should _________

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用括号内所给动词的适当形式填空。
1. More trees and flowers should _________ (plant) to make our hometown beautiful.
2. We must do everything we can _________ (keep) waste water from running into rivers.
3. When I was young, my grandfather told me that the sun _________ (rise) in the east.
4. Would you mind _________ (not smoke) in public?
5. John _________ (chat) with his son while his wife was cooking in the kitchen.
1. be planted   2. to keep   3. rises   4. not smoking   5. was chatting