5. How about making posters on energy saving and hanging them around our school?
6. We shouldn't use too many plastic bags because they are very hard to dissolve
7. If people stop using dynamite for fishing, a lot of sea creatures will be well preserved
8. Polluted water can directly kill fish and do harm to people's health
9. The company pumped raw sewage directly into the river, so it was fined
10. Fish may be killed because of the trash we throw into the water
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