根据句意，用括号中所给词的适当形式填空。

1. Computers are used by people for _____ problems. (do)

2. Spaceship _____ people have reached other parts of the universe. (with)

3. Britain is only 30 kilometers away from _____.  (French)

4. I think English is _____ than math. (important)

5. The Great Wall is over six _____ kilometers long. (thousand)

6. The hat was _____ of silk. (make)

7. The moon _____ round the earth . (travel)

8. Sheep are _____ by farmers for producing wool and meet. (keep)  

9. Do you know the boy _____ his hand towards us? (wave)

10. Everyone is supposed _____ a seat belt in the car. (wear) 

《医疗机构管理条例实施细则》中规定住院病历的保存期不得少于（）。

A.15年

B.20年

C.25年

D.30年

E.35年