1. 用所给单词的适当形式填空

1. （1） People in Japan are supposed (bow) when they meet for the first time.

3. （2） She (greet) Paul's mother the wrong way last night.

5. （3） I felt (relax) lying in the sun. What a good time!

7. （4） I think you should (ask) what you are supposed to wear.

9. （5） In Switzerland, people never visit a friend's house without (call) first.

11. （6） He (be) supposed to arrive at 8:00, but he arrived at 9:00.

13. （7） Though you failed this time, don't give up (study) . You still have a lot of chances.

15. （8） The main thing is (learn) how to be polite.

17. （9） Remember (turn off) the light when you leave the room.

19. （10） I think his idea is worth (consider).