Ответ:
1. The helmet is in the box.
2. The gloves are on the desk.
3. The mobile phone is on the sofa.
4. The CDs are in front of the computer.
5. The hairbrush is behind the book.
6. The roller blades are under the table.
7. The guitar is next to the armchair.
8. The camera is in front of the window.
9. The keys are behind the door.