改正下面短文中的错误。对标有题号的每一行作出判断：如无错误，在答题卡该行右边横线上画一个勾（√），请在有错误的地方增加、删除或修改某个单词。
注意：1.每处错误及其修改均仅限一词；
2.原行没有错的不要改。
It is important to do with the rubbish in cities. Rubbish must be     1.____________
treated properly. Thus, it may cause a lot of prob­lems. It may pollute  2.____________
the air and water. When people breathe the polluted air or drink polluted   3.____________
water, we may get ill. Our city has begun to pay attention to the roblem.   4.____________
As far as I know, some rubbish is sorted and sent to different facto­ry. 5.____________
Rubbish, such as old newspapers and glass, are recycled. Some harmful      6.____________
rubbish is sent to a certain place and buried. Waste air is cleaned after it  7.____________
goes into the air. Waste water is treated before it poured into rivers. To    8.____________
protect from the environment, the government has passed laws to   9.____________
prevent people from throwing rubbish everywhere. We should do our    10.___________
best to take good care of the environment and fight against pollution.