1. 用所给单词的适当形式填空

1. （1） I suggest(go) home now.

3. （2） Tourists should help look after (nature) environment.  
   

5. （3） He is (know) as a successful actor.  
   

7. （4） After(watch) TV, he went to sleep.

9. （5） He will go(madly) if he knows this.

11. （6） The young man went out , (laugh) loudly.
    

13. （7） I happened(know) your address, so I can find you.

15. （8） He's(experience) in looking after children.

17. （9） Be careful(not hurt) her feelings.

19. （10） The plants need(water) once a week.