一年中,北半球大陆上的最高气温出现在_______月,最低气温出现在_______月。
Teenagers should learn how to protect (they) from all kinds of dangers.
We are supposed to read (quiet)in the library.
Don't worry about the children. They are old enough to look after t .
In China more and more people r shared bikes to and from work.
A p at a school is a place for students to play and do sports.