Underline the correct preposition.
1    I'm not very keen on modern technology. A lot of it is too confusing for me.
2    He's hooked on computer games. He stays up all night playing them.
3    Shhh! I'm trying to listen to the radio!
4    Sarah is doing research on computer technology at university.
5    I was so bored on the journey. I wish I'd had my MP3 player.
6    Is that the digital camera that you won in the competition?
7    Jane has a very important job with a computer company and is always on the move.