Điền vào chỗ trống với các giới từ thích hợp
A, are you ....... class 6a
B, Nam's school is ....... the city
C, It's 6.30 . We are late ....... class
D, my sister has lunch ....... 11.30
E, my class room is ....... the firsh floor
F, I go to school ....... the morning
G, there are 4 books ....... my desk
H, there are 11 classroom ....... my school