Ответ:

13. An

14, 15, 16, 17, 18 - не ставится артикль

19. An

20. A

Задание 5.

1. An

2. Пропуск

3. Am

4. An

5. A

6. An

7. A

8. A

9. An

10. A

11. Пропуск

12. A

Задание 6.

1. Is

2. Are

3. Is

4. Am

5. Is

6. Are

7. Are

8. Is

9. Are

10. Am

11. Am

12. Is

13. Are

14. Is

15. Is

16. Are

17. Am

18. Is

19. Are

20. Are

21. Is

22. Is

23. Am

24. Are

Объяснение: