1. 用所给单词的适当形式完成句子

1. （1） Dogs are  (help) and they are our friends.

3. （2） Welcome(live) here

5. （3） You'd better (finish) your homework first.
   

7. （4） They(play) football on the playground just now.
   

9. （5） The baby(fall) asleep half an hour ago.

11. （6） He is a famous (act).

13. （7） Red (mean) good luck.

15. （8） Please help (you) to some fruit.

17. （9） In the(darkness) room, I couldn't see anything.
    

19. （10） The girl started(cry) when she couldn't find her mother.