此题要求改正所给短文中的错误。对标有题号的每一行作出判断：如无错误，在该行右边横线上画一个勾(√)；如有错误(每行只有一个错误)，则按下列情况改正：
此行多一个词：把多余的词用斜线(╲)划掉，在该行右边横线上写出该词，并也用斜线划掉。
此行缺一个词：在缺词处加一个漏字符号(∧)，在该行右边横线上写出该加的词。
此行错一个词：在错的词下划一横线，在该行右边横线上写出改正后的词。
注意：原行没有错的不要改。
此题要求改正所给短文中的错误。短文中有10处错误，每句只有一处。
It is important to do with the rubbish in cities. Rubbish must be ________
treated properly. Thus, it may cause a lot of problems. It may pollute ________
the air and water. When people breathe the polluted air or drink polluted ________
water, we may get ill. Our city has begun to pay attention to the problem. ________
As far as I know, some rubbish is sorted and sent to different factory. ________
Rubbish, such as old newspapers and glass, are recycled. Some harmful ________
rubbish is sent to a certain place and buried. Waste air is cleaned after it ________
goes into the air. Waste water is treated before it poured into rivers. To ________
protect from the environment, the government has passed laws to ________
prevent people from throwing rubbish everywhere. We should do our ________
best to take good care of the environment and fight against pollution.