为你解答。
1、Everyone should play a role in cleaning up the river.
2、The river used to be very clean, but it's very dirty now.
3、Factories are pouring waste water into the river.
4、We should take the bus or subway instead of driving.
5、Sharks are in great danger now.
6、What should we do to protect the earth?
7、We should bring cloth bags when we go shopping.
8、The river is badly polluted. The fish in the river are dead.
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