语法填空。

    I'm Lucy．This is a map of our school．six buildings(楼房)in it．They are a dining hall，an art building，a sports hall，a science building，a classroom building and a library．Our classroom building is the science building．And it's  the library．In the middle of our school,a big playground(操场)．We often play sports on it．Next to the playground is the art building．It'sthe dining hall and the sports hall．Our school is big，and it's nice．