Today there is more and more pollution and the environment is becoming worse and worse. Because of the pollution, we     1     ever see the blue sky or the white clouds. So we have to know how to protect（保护）the environment. Here is some     2    .

First, we can stop driving our own cars. We can go to school on foot or by bus. We can advise our parents     3     by bike or by bus. Not only can it protect the environment, but also it is good for our     4    .

Second, we are not supposed to drop litter(垃圾) anywhere. We should put them     5     the trash bin(垃圾桶). Also it’s best     6     up the litter on the ground when we see them. It is a good habit to protect our environment.

Third, we should save the paper, the water, the food, the light(灯) and so on. If we leave the classroom, we     7     off the light.

Fourth, we should protect the plants and animals. Please don’t cut down trees and plant     8     trees.

All in all, everyone should play a     9     in protecting the environment.     10     we do like this, our environment will become worse.