a / an articles

1 . It's ____________________ apple .
2 . It's ____________________ rubber .
3 . It's ____________________ white desk .
4 . It's ____________________ yellow bag .
5 . It's ____________________ orange pencil .
6 . It's ____________________ piano .
7 . It's ____________________ igloo .
8 . It's ____________________ window .
9 . It's ____________________ ear .
10 . It's ____________________ queen .
11 . It's ____________________ tree .
12 . It's ____________________ umbrella .
13 . It's ____________________ doll .
14 . It's ____________________ orange .
15 . It's ____________________ ice cream .
16 . It's ____________________ notebook .
17 . It's ____________________ elephant .
18 . It's ____________________ goat .
19 . It's ____________________ parrot .
20 . It's ____________________ octopus .