单词拼写。

1. Can’t you see the "No smoking" s_______?

2. Working with you gave me a lot of p_______. I really enjoy it.

3. The company was e_______ in 1950.

4. I think I can f_______ up the clock.

5. Something is wrong with the TV. It needs r________.

6. There is no chalk in the classroom. Could you please go to my office and

f_______ some for me?

7. Chen Zhong sings songs well. He wants to be a p_______ singer in the

future.

8. People in these countries don’t have enough food to eat,and many of them have

died of h_______.

9. You can i_______ how different the table manners there are from ours.

10. The m_______ part of the job is done by machine.

蒸汽发生器自发蒸汽压力低的原因，以下正确的是（）。

A、发生器补水量大

B、控制阀失灵

C、后路不畅

D、排污阀开得过大