Choose the correct preposition to complete the sentences

1. As I look
   [to|back|forward] on my school years, I regret nothing.
2. I've been looking
   [at|in|for] the solution for years, do you think you can do it in a week?
3. Look
   [away|out|through]! There's a cyclist behind you.
4. She's so arrogant! I have the way she looks
   [up|down|forward] on people.
5. I'm looking
   [forward|up|after] to the camp trip next week. It's going to be wild!
6. I didn't have time to read the report carefully, I just looked it
   [up|through|within].
7. Can you look
   [after|in|through] my cat while I'm away?