写作时完成以下问题：
What things can harm the invironment?
What kind of pollution can you find in our daily life?
What kind of pollution harms our life most?
What do you think we should do to improve our invironment?
What has been done to solve these problems in our town?
例如：No spitting on the ground.
No drawing on public walls.
No smoking in public places.
No throwing cigarette butts around.
No carving on trees and desks.
Don’t cut down trees.
Don’t throw about waste batteries.
Don’t throw litter around.
Take care of trees and flowers.
Take care of animals.
Save water.
Keep off the grass.
Put different rubbish into different dustbins.
Stop pouring waste water into rivers and lakes.
Put waste paper in wastebaskets for recycling.
Pick up rubbish and throw it into dustbins.
再如：
Pollution is a "dirty" word.To pollute means to make things unclean or unfit for using.Nowadays,our earth has been seriously polluted.Pollution has a long history.People have been polluting the earth from the time when they first made fire,washed his colthes in the river,and threw waste on the
ground.When the land was made thin and the water became dirty,people moved to another place.At first,the problem was not so serious because there was plenty of clean air,land and water.There weren't so many people back then and thier needs were fewer.All the dirty things could be absorbed by nature and recovered soon.But this is no longer true.The increasing population and the developing industry have changed it a lot.People are slowly poisoning the invironment.
As we know,environmental pollution does great harm to human beings.It begins to attack our health,our happiness,and our lives,so it must attract our attention.Now more and more people have realized how seious the problem is.Fortunately,our goverment is doing its best to take measures to fight against pollution.We have done a great deal of work,but there is still a long way to go.We must keep on fighting until the environment improves and we get away from pollution.We are sure that we will win the battle.