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第54页

信息发布者：

in the street/on the road

we can't/mustn't/shouldn't turn left

in the library/reading room

we can't/mustn't/shouldn't talk loudly there

be friendly to our classmates. And we must listen to our teachers carefully

It's kind of you to help others.

talk loudly in class. It's impolite. Don't run in the classroom.

We mustn't eat or drink in class.