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?