用所给单词的正确形式填空。

1. My friends______ ( not play) football on Sunday.

2. He often______ ( swim) in the river every Sunday.

3. It's five o'clock now. Some people in London ______( run ) for trains.

4. —What are they doing?

    —They______ ( listen ) to music.

5. I can't _          ( speak) English , but I can write it.

6. Let's______ ( sweep) the classroom.

7. Yuanxiao______( bring) you good luck all the year round.

8. My mother and I______( clean) our living room now.

9. I want______( paint) my house white.

10. The boy______( watch) TV with his parents in the living room at the moment.

导致饮片变质的环境因素有（）。

A.空气

B.日光

C.湿度

D.温度

E.尘埃