I am No.5 Middle School's student

I am in No.5 Middle Shool I am No.5 Middle School's student I am in No.5 Middle School与I am at No.5 Middle School这两种表达都正确吗? i am（ ）Grade Seven （ ）No.5 Middle School 填介词 I am a student in NO.1Middle I am in No.6 Middle School.I am in the No.6 Middle School.这两个哪个对? Now i am in Class 6,_3_,No 5 middle School.I have a sisther._4_name is Lucy. I am o pupil of Grade one,i am in No.1 Middle School. I am o pupil of Greda one,i am in No.1 Middle School. I am a student of NO.3 middle school.i am a student of NO.3 middle school.把of 改成in 这里是表示所有格么? I am a middle school i am in class two, grade one ——no.8 middle school 横杠上填什么? I am 16 and Istudy in NO.1 middle school改倒装 no.5 middle school Are you a middle school student now?a.No,I am b.Yes,Ido c.yes,I am d.no,I do not I study at No.5 Middle School. =I ( )a () at No.5 Middle School.(同义句） When i am middle aged.为什么不用middle age呢? I am an outgoing girl called xxx who is from No.1 middle school.这句话有没有错?