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1. were doing
2. was watching
3. weren't sleeping
4. was working
5. was studying
6. wasn't paying attention
7. Was Brian talking
8. weren't cooking
9. was playing
10. was Howard giving
11. wasn't expecting
12. were you thinking
13. Was she doing
14. was drinking
15. were meeting
16. wasn't having
17. were discussing
18. Were they working
19. was sleeping
20. weren't taking