Ответ:

1. Few

2. a few

3. a few

4. a few

5. a few

6. few

7. a few

8. a few

9. a few

10. few

11.a few

12. a few

13. a few

14. few

15. a few

16. a few

17. a few

18. few

19. a few

20. few