5. It's important to work hard if you want to      (success).

4. Sometimes we can prevent a cloud from      ( produce) rain.

3. His father has been        ( die ) for three years.

2. I can't tell the       ( different ) between the two words.

1. Drinking too much wine is        (harm) to your health.

15. The film was so boring that n        of the three children liked it.

14. My neighbor is sure that someone has just s       his new mobile phone, because he can't find it anywhere.

13. This is the most b        knowledge of Unit 1. You should remember it.

12. Don't leave r      here and there. Put it into the dustbin.

11. The woman coughed day and night，so she had a p      in her chest.