Verb + Preposition

It's so noisy that I can't concentrate _____ my homework.

Don't worry - I'll pay ____ the tickets.

I borrowed a pen ____ my classmate.

I've been waiting ____ the bus for more than twenty minutes!

Julie: "What time shall we eat dinner?" Gill: "It depends ___ John - we'll eat when he gets home".

When we arrived ___ the cinema, the film had already started.

Please explain this problem ___ us.

She was listening ___ the radio when the doorbell rang.

John worries ____ his exam results all the time.

My flatmate listens ___ a lot of jazz.