1. 用适当的冠词填空

                 a; an; the; /

1. （1） There is “u” and ”s” in word “us”.
   

3. （2） This is useful book. I have read it for hour.
   

5. （3） sun rises in east.

7. （4） Changjiang River is longest river inChina. 

9. （5） Washington is capital of USA.

11. （6） Greens are living at the end of Turner Street .

13. （7） He joined the army in spring of 1998.

15. （8） After I had quick breakfast . I hurried to school.