Choose the correct tense (past simpe or past continuous) in these

Choose the correct tense (past simpe or past continuous) in these sentences.
1. I knew he was a police officer because he was WEARING/WORE his uniform.
2. She took her dog because it NEEDED/WAS NEEDING a walk.
3. She wore her sunglasses because the sun was SHINING/SHONE.
4. I FAILED/WAS FAILING my exam twice last year.
5. They WATCHED/WERE WATCHING TV when they heard a crash.
6. Last year we WENT/WERE GOING camping and we had a great time.
7. My mum wa TAKING/TOOK a picture when she dropped the camera.
8. Hippies LIVED/WERE LIVNIG in the 1960s and 1970s.
9. The plane ARRIVED/WAS ARRIVING in Madrid on time.
10. I PLAYED/WAS PLAYING football when I broke my leg.