in.
1.There is a book in the bag.
2 The shop is behind that building.
3. i like to sit in the corner of my room.
4 There are pens in the pencil-box.
5 I go in the country every day.
6 I like swimming in the swimming-pool.
on
1. I live on the second floor.
2 There is a cat on the sofa.
3 The school is on the opposite side of the street.
4 I put my book on the desk.
5 The picture is hanging on the wall