Ответ:

1. got; had already started.

2. was dreaming.

3. saw, was crossing.

4. had been painting, came.

5. was lying, was weeding.

6. bought, had looked.

7. had sent.

8. was dusting, broke.

9. had never been.

10. were studying, went.

11. hadn't rung, was.

12. had been working, went.

13. weren't sleeping, returned.

14. did they visit.

15. had written.

16. hadn't paid, didn't pay.

17. went, was shining, was.

18. had never seen.

19. Did Simon and Alice get.

20. had been waiting, appeared.

21. were rollerblading, phoned.

22. met.

23. did you spend.

24. were sitting, heard.

25. had packed.

26. had been sunbathed, started.

Вроде так. Надеюсь, что помог)