第40页

信息发布者：
A

A
A

C

B

B
If you get into trouble, you can write to me.
He offers his seat to an old man on the bus.
Students shouldn't stay up because they need enough sleep.
Students have difficulty achieving a balance between 
schoolwork and hobbies.
I think it is bad for you to stay out late.
helpful
chatting
didn't get
to communicate
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