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many plastic things ? Should ? wear cotton clothes ? Shouldn’t ? throw rubbish everywhere ? throw rubbish = litter ? Should ? turn off the lights when we leave the room ? Shouldn’t ? leave lights on when we go out ? turn on the lights when we go out ? We should save water. We shouldn’t waste water. ? ﹙﹚ We should plant trees and take care of them. ? ﹙﹚ We should keep our rivers and oceans clean. We shouldn’t ma