根据课文内容填空， 写在下方横线上。
We live 1． the Earth. The Earth is a beautiful place. There 2． rivers, oceans, land and forests. There are many 3． plants and animals too. People, plants and animals need clean water and 4．. Sometimes people throw 5． into rivers and oceans. Sometimes people cut down too 6． trees. 7． from cars and factories 8． the air dirty. The Earth 9． sick. Now people work together to 10． the Earth clean and healthy.
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