改错句、速度.谢谢.1.we should ride a bike to school or by bus. 2.We

改错句、速度.谢谢.
1.we should ride a bike to school or by bus.
2.We should ask my sather don't drive.
3.rrees is er sriend.
4.you not throw rubbis bins.
5.the pollution is very in danger.
6.we should don't cut downtrees.
7.he offer much eat
8.shouldn't pollution earth
9.the river have lots of rubbish is vert dirty
10.they are all people make
11.let's attend the pollution fighter and saving the earth
12.let's protect itself
13.it cool the air and cleam it.