1. 根据汉语或首字母提示写单词，补全句子。

1. （1） There is an old(松树) in front of the house.

3. （2） I need to buy some (家具) for the new house.

5. （3） People need(氧气) to breathe.      

7. （4） The cat fell into the(洞) and couldn't climb out of it.
   

9. （5） The(树枝) of these trees are strong and big

11. （6） We have some problems in doing it. But the m problem is that we don't have so much money.
    

13. （7） The two little boys often f for toys, but later they play together happily again.

15. （8） — What does the company p?

     — It makes toy cars. Small children like them.

17. （9） Smoking too much may cause cancer (癌症). It is a terrible d.

19. （10） — The box is too heavy. Can you help me to c it?
    

      — Sure.