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Here are the sentences with the correct verb forms filled in:

10. Laura was studying at 11pm last night.

11. I was walking along the road when I met an old friend.

12. It was being a day in December. Snow was falling, children were singing carols, and people were doing their Christmas shopping.

13. My ex-boyfriend always missed the bus and arrived late.

14. When I called Julie, she was sleeping.

15. Why were you crying when I arrived?

16. When he got home, we started to eat dinner.

17. At 10am yesterday I was sitting on a bus.

18. I enjoyed my book so much that I didn't notice the train had stopped.

19. David wasn't working when I arrived.

20. Mr. Black wasn't working in the garden at 10pm last night.