一、根据首字母或中文提示填写单词（每小题0.5分，共15分）
1. Harbin is in the n_______ of China.
2. Don't p_______ others while you get down the stairs.
3. You're speaking too fast. I can't f_______ you.
4. The man in police u_______ is my father.
5. He lives n_______. So we often play football together.
6. Look! A train is going t_______ tunnel.
7. Choose the c_______ answers to the questions.
8. 'Pollution' m_______ 'the state of being dirty'.
9. There's a big s_______ on her face, which shows(表明)she's very happy.
10. In the class meeting, you must take n_____
