1. 选择合适的答句

A. I can't find my book. B. Read the newspapers to old people. C. Over there. D. Because we can reuse them. E. Yes.

1. （1） Why should we keep them?
3. （2） Do you have any ideas?
5. （3） Where is the underground station?
7. （4） What's the matter?
9. （5） How can we help others?