4. fell/ was riding
5. were living
6. lost/ was walking
7. was going/ hit
8. was studying/ was having
9. had just left/ rang
10. were sitting/ saw
11. was calling/ wasn’t/ was studying
12. didn’t hear/ was sleeping
13. was shining/ were singing
14. were talking/ walked
15. weren’t/ were playing
16. fell/ was reading
17. was snowing/ was shining
18. was shovelling/ brought
19. had/ was driving/ hit
20. decided/ were starving
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