Помогите, спасите -3-

1) is

2) are

3) am not

4) isn't

5) aren't

6) Is

7) are

8) is

9) Are

10) is

11)  am

12) are

13) is

14) are

15) are

16) are

17) is

18) isn't

19) is

20) am

21) is