在公共场所哪些事情该做，哪些事情不该做。用should和shouldn't写出来吧!请至少写出五句建议。

【答案】We shouldn't talk quickly in the library. We should take turns when we are getting on a bus We should keep the grass clean. We shouldn't throw litter around in the park. We shouldn't play football in the street．

【解析】

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