Complete the exercise with the appropriate articles.

1. a; 2. a; 3. the; 4. a; 5. the; 6. the; 7. the; 8. a; 9. the; 10. a; 11. the; 12. the; 13. the; 14. a; 15. the; 16. a; 17. the; 18. a; 19. the; 20. the; 21. a; 22. the; 23. an; 24. the.