给下列句子排序。
（ ）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?
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