At,In,On.

1. My computer in my bag.
2. I am going in New York tomorrow.
3. I lost my money in the shop.
4. I wait for my friend at school.
5. I go in the school at 8:00 o'clock.
6. I go at airport.
7. I go on the beech.
8. I write on the desk.
9. I play on the computer.
10. I like play football on the grass.