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take the bus or the metro to work or to school.
We can plant more trees and flowers. We can throw the rubbish in the bin.
save energy. We should reuse and save water.
We should plant more trees.
        Look. The park is dirty and messy. We should not throw 
rubbish in the river or on the ground, because it will pollute the 
river and make the ground dirty. We should put rubbish in the bin.
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