单词拼写。

1. Eating green food can help to keep you _____ (健康).

2. The store with a red sign sells _____ (男式) shoes and clothes.

3. People in the U. S. can't drink beer or wine before they _____ (满) 21.

4. The moon is shining brightly in _____ (透过) the window on her face.

5. The Iraq War _____ (持续) longer than expected.

6. She spoke so _____ (小) that I could hardly hear her at first.

7. It took the firemen quite some time to get to the _____ (二十) floor.

8. The children are fed up with _____ (唱) the same song again and again.

9. The Browns often leave their elder son by _____ (自己).

10. It is said that _____ (几个) more foreigners will come to our school soon.

若曝气池按传统活性污泥法和阶段曝气法运行，回流比一般控制再（）左右。

A.20%

B.50%

C.70%

D.100%