"a" or "an" 02

Fill in the blanks.
1. This is elephant.
2. That is poster.
3. This is apple.
4. It is pencil.
5. That is board.
6. It is diamond.
7. That is box.
8. This is dog.
9. That is marker.
10. It is wastebasket.
11. It is globe.
12. That is crayon.
13. It is orange.
14. It is ant.
15. It is eye.