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答案：
1. We should plant trees.
2. We should not litter.
3. We should not pollute the water.
4. We should protect forests.
5. We should take public transport.
6. We should save water.
2. We should not litter.
3. We should not pollute the water.
4. We should protect forests.
5. We should take public transport.
6. We should save water.
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