一、根据句意和汉语注释，写出单词的正确形式：

1.Over 200 cars are_________________(生产) in this factory in a week.

2. Trees reduce________________(灰尘) and help keep the air clean.

3.Our school will do some___________________(调查) on reading novels.

4.There is a lot of_______________(石油) under the ground.

5.The new factory needs a lot of_________________(煤) and natural gas every day.

6. Sometimes bad weather___________________(产生) natural disasters.

7.You can work out the math problem in this__________________(简单的) way.

8. Don’t drop litter ________________(care), or you will be_______________(fine).

9. There are some_________________(different) between British English and American English.

10.If we don’t take action, the waste will_________________(pollution) the lake.

11.Bill Gates is one of the______________ (rich) men in the world.