III. Complete the text with the correct prepositions.

We have English lessons (1) Room 18. There are 24 tables for students and one desk for the teacher. (2) the walls, there are lots of posters of England. There’s a cupboard at the front of the room and (3) the cupboard, there's 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 lesson.