Choose the correct preposition

1.I can see a boy ... the picture. 2. The boy is sitting ... the table. 3. The bookcase is ... \(in/on/at\) the right. 4. There is a nice picture ... the wall. 5. She never keeps her money ... her bag. 6. Don’t sit ... the ground. 7. I think her flat is ... the third floor of that building. 8. The children are playing ... the garden. 9. When we were ... Spain, we stayed ... a hotel. 10. He sat down ... the chair.