at 还是 in the big fire可是我的作业上写的就是in 老师给我打的是错

Unintended,I fell in love with you at the fir. I bought this book at the big bookstore across the street.为什么是AT 不是IN? at 还是 in the big fire可是我的作业上写的就是in 老师给我打的是错 in the library还是at the library? at the kitchen还是in the kitchen in the play 还是 at the play in the war 还是at the war at the party还是in the party? at the supermarket还是in the supermarket? in the hotel 还是at the hotel in the olypic game还是at the ... in the meeting 还是at the meeting in the park 还是 at the park at the community还是in the community ---at the evening 还是 in the evening in the theater还是at the theater? FIR THE FIRST ORDER 100% ADVANCED AT THE MOMENT OF THE ORDER How__ the population in china is!填big还是large?