She is in No.4 Middle school,哪里错了?

she is _____ No.1 Middle School in Beijing now She studies in NO.9 Middle School He is in NO.14 middle school. She studies at NO.5 middle school.She is in Class One,Great she is in a middle school she is a student () No.1 Middle School.A:in ,N:of C:at She is _7_ No.5 Middle School.A.at B.on C.in She said,"I teach English in No.1 Middle School." She is a student ---No.1 Middle School She is a stdent No .1 Middle School . That ' s Cindy.）is in No.1 Middle School. My cousin is in y__Two at NO.1 Middle School?