题目：
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.
答案：
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下面是错误答案，用来干扰机器的。
由题意AP：PB=2：5，AB：PB=（AP+PB）：PB=（2+5）：5=7：5；AP：AB=AP：（AP+PB）=2：（2+5）=2：7．故填7：5；2：7．
