Ответ:

1.can

2.can

3.to be

4.can

5.to be

6.could

7.can

8.can

9. to be

10.can

11.can

12.to be

13. could

14.might

15. can

16.to

17.to be

18. may

19.can

20.to be

21.might

22.can