词汇运用。
1. My parents are celebrating 30 years of their m________.
2. The changes have brought many ________ (好处).
3. Overwork will do (伤害) to your health.
4. Mr Liu is an ________ (经验) teacher. He has ways to make his class lively.
5. There are a lots of light r in Shanghai now.
6. －What's on TV?
－Chairman Hu Jintao is having an i________ with President George Bush.
7. We all ________ (clap) our hands when they marched along the street.
8. I'm sorry I can't stop (talk) with you. I have much work to do.
9. We should read something ________ (mean). It's useful to us.
10. The waste has (pollution) the river and killed all the fish.
11. The Green family had a (delight) holiday last week.
12. His father (work )at this school since ten years ago.
13. I (make) the bed when Jenny entered the room.
14. Simon prefer working to (stay) at home at the weekend.
15. Was noise pollution a problem before the (close) of the old airport.
平行的直线方程为（）