The earth is our home. We must look  it well. That is to say we must keep the land, air and water clean.

    But man has been polluting  earth since he first made a fire. People washed their clothes in the river and threw dirty things on the ground. Many  (year) ago, pollution has not so serious  there were not so many people. When the land or the river became dirty in one place, man moved to another place. But. now, there is  (little)clean air, land and water. Man is  (pollute) the whole world and there  neither enough clean air, nor clean land, nor clean water. More people, more pollution.

    Is it possible to get rid of(解决)pollution? We are glad to say that people have come to know the  (dangerous)of pollution and a large number of them are working hard  (protect)our earth. One of the  (good) ways is to stop the pollution.