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 in No.5 Middle Shool 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 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? 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 No.5 Middle School's student Now i am in Class 6,_3_,No 5 middle School.I have a sisther._4_name is Lucy. 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 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 i ____ in no.8 middle school. i am（ ）Grade Seven （ ）No.5 Middle School 填介词 I am in my （） year in this middle school I am a student h_____ in a middle school. here i am in the middle of nowhere是? 改错:I'm in No.4 middle school I s( ) in NO.1 Middle School ,Hefei.