только !
Надо раскрыть скобки в PASSIVE!

ответ:7 is listening

8 was listening

9 were playing

10 are playing

11 is singing

12 was singing, entered

13 are working, are planting

14 is wearing

15 was playing

Тип того

7-is listening

8-was listening

9-were playing

10-are playing

12-was singing/ entered

13-are working/are planting

14-is wearing

15-was playing