Usage of Articles

Please correct me with the wrong usage of article

1. Copper is -an-- useful metal.
2. He is not -a-- honorable man.
3. -An-- able man has not always a distinguished look.
4. -A-- reindeer is a native of Norway.
5. Honest men speak the truth.
6. Rustum is ---.
7. Do you see -a-- blue sky.
8. Varanasi is --a- holy city.
9. Aladdin had --a- wonderful lamp.
10. The world is --a- happy place.
11. He returned after -an-- hour.
12. The school will shortly close for the Puja holidays.
13. --- sun shines brightly.
14. I first met him -an-- year ago.
15. Yesterday --a- European called at my office.
16. Sanskrit is --a- difficult language.
17. The Ganga is -a-- sacred river.
18. The lion is -a-- king of beasts.
19. You are --a- fool to say that.
20. French is --an- easy language.
21. Who is the girl sitting there?
22. Which is the longest river in India?
23. Rama has come without -an-- umbrella.
24. Mumbai is --a- very dear place to live in.
25. She is -an-- untidy girl.
26. The children found -an-- egg in the nest.
27. I bought horse, ox, and --a- buffalo.
28. If you see him, give him --a- message.
29. English is a language of --- people of England.
30. The guide knows the way.
31. Sri Lanka is -an-- island.
32. Let us discuss the matter seriously.
33. John got -a-- best present.
34. Man, thou art the animal.
35. India is one of the most industrial countries in Asia.
36. He looks as stupid as -an-- owl.
37. He is -a-- honour to this profession.