Complete the passage with a suitable preposition

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.