Ответ:

1. Do

2. are

3. go

4. are

5. does

6. clean

7. must

8. were

9. did

10. are

11. was

12. isn't

13. is

14. understand

15. aren't

16. were

17. does

18. do

19. ?

20. here

21. any

22. ago

23. never, always

24. is