用词的适当形式填空。

1. Do you learn English by _______ (ask) friends for help?

2. He enjoys _______ (help) others in trouble.

3. Miss Liu said that _______ (read) was good for us.

4. What is the best way _______ (study) physics?

5. He has trouble _______ (work) out the math problems.

6. What about _______ (go) out for a walk?

7. It is _______ (important) for me to know his story, because I don't know him.

8. Thousands of people _______ (lose) their lives in the earthquake last year.

9. Can you tell me the _______ (different) between the two words?

10. We are _______ (take) notes while the teacher is giving a lesson.