We live on the Earth．The Earth was ，but now some parts are dirty．Let's work together to keep the Earth pretty and healthy because the Earth is only home for all the living things．We should ．We should ．We also need water and trees．So we shouldn't ．We should stop ．
The Earth is sick
The Earth was clean and beautiful．
Now some parts are
Our city is ．There is／are ．The rivers are ．The air is ．We should keep our city clean and beautiful．We should it. We mustn't it．
