Complete the passage with a suitable preposition

VIII. Complete the passage with a suitable preposition.
We have English lessons (1) ________ Room 12. There are 24 tables for students and one desk for the teacher. (2) ________ the walls, there are a lots of posters of England. There’s a cupboard at the front of the room and (3) ___________ the cupboard, there is a TV and DVD player. Sometimes we watch films. There are some bookshelves (4) __________the classroom. (5)___________ the shelves, there are a lot of English books. Our books are (6)__________ the teacher’s desk. He wants to look at our homework. Our school bags are (7) _________ the floor, and there is some food (8)____________ the school bags. It’s now 5.30 pm. We are (9)__________ home, but our teacher is (10) __________ school. He often stays late to prepare for tomorrow’s lessons.
Helppp me với ạ