Tony has just got an e-mail from his pen friend(改为一般疑问句） Saving our world is our duty同义句
you mustn’t throw away paper here and there祈使句
人气：439 ℃ 时间：2019-10-01 09:33:32
解答
Has Tony just got an e-mail from his pen friend?
It's our duty to save our world.
Don't throw away paper here and there.
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