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 _____  .