改错。(把错误的选项写在括号内，并在横线上改正。)(6分)
Welcome _____ our school. A. on B. for C. to
--Is that the computer room? --No, ________. A. it is B. is itn’t C. it isn’t
Do you have ______ art room? A. aB. an C. the
How many _______ are there in your class? A. students B. student C. student’s
--Where’s the library? --It’s____ the first floor. A. inB. on C. at
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