根据句意补全单词。

1. —You shouldn't shake hands with her. You should bow.

    —I'm sorry. I don't know the _____  here.

2. There are lots of _____  in the school. You must obey them.

3. There are many trees on both _____   of the street.

4. The machine doesn't work. Is there_____   wrong with it?

5. He_____  the present yesterday, but he didn't want to accept it.

6. The policemen_____   the thief by the arm.

7. When we were in Shanghai, we took many photos with a _____  .

8. It often rains in England. When you go there you'd better take an _____  .

9. The actor's _____  is very wonderful. We are interested in it.

10. You can buy this medicine in a _____  .