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10. I don't know when       (shake) and when not to.

9. Do you know a famous singer      (call) Song Zuying?

8. This is her      (two) time to come to China.

7. I invited him      (go) to the movie with me,but he refused.

6. What are you supposed        (do) if you don't know the way?

5. Different countries have different c      

2. People in Korea are supposed to      when they meet for the first time.

3. You're supposed to        hands with your friends when you meet them in China.

4. When they met,they were very happy and      each other.

1. The girl often k       her mother's face. It makes her happy.

20. 我們經(jīng)常順便拜訪朋友的家。

We often just__________  ________ our friends' homes.

19. 你應(yīng)該努力提高你的閱讀技能。

You should_________ ________  ______ to improve your reading skills.