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.