Each sentence has a mistake

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IV. Each sentence has a mistake. Circle A, B, C or D..
28. What helped you to do your homework yesterday ?.
28.
A
В
C
29. The film didn't win any acting Oscars despite of starring Mery
& Robert.
29.
A
В
C
D
30. Turn on the TV when you don't watch it.
30.
A
В
C
D
31. We used to living_in HoChiMinh City when we were young.
31.
A
В
C
D
32. Although they were tired, but they wanted to watch the film.
32.
A
B
C