给下列句子排序。(8分)
( )Do you have a library ?
( )Yes ,we do . It’s on the second floor.
( )Forty-five students.
( )No, it isn’t. It’s the teachers’ office.
( )Welcome to our school! This is my classroom.
( )This way, please.
( )Is that the computer room?
( )It’s so big! How many students are there in your class?