on the fifth floor,还是in the fifth floor?

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onthefifthfloor,还是inthefifthfloor?onthefifthfloor,还是inthefifthfloor?onthefifthfloor,还是inthefifthfloo

on the fifth floor,还是in the fifth floor?
on the fifth floor,还是in the fifth floor?

on the fifth floor,还是in the fifth floor?
ON