Exercise 1: Fill in A or An before the words correctly.

1. a cat
2. an airplane
3. a pencil
4. an elephant
5. a turtle
6. an umbrella
7. a tomato
8. a hotdog
9. an eggplant
10. an orange
11. an owl
12. a flower
13. a house
14. an igloo
15. a key
16. a dog
17. an egg
18. an ant
19. a book
20. an apple