Reason, result, & purpose

I did my homework today, (a)   I can play video games.

John bought a new TV (a)   his old one stopped working.

I studied hard for the exam (a)   I could have a good mark

I wish I had AirPods (a)   I could listen to music while I'm on the bus.

I watched TV (a)   there was nothing else to do.

I really loved that books, (a)   I recommended it to my friend.

I only know about that computer game (a)   Jenny.

I had to write a report, (a)   I did a lot of research the Internet.

I bought my tickets online (a)   I didn't have to wait in line.

(a)   my video game hobby, I have friends all over the world.