Fill in the blanks with a/an

| GRAMMAR (NGỮ PHÁP)
ercise 1. Fill in the blanks with a/an.
centres in the wor
1.
orange
11.
builder
truck
2.
12.
hour
3.
flower
13.
eraser
4.
apple
14.
desk
5.
rabbit
15.
white umbrella
6.
8-year-old girl
16.
baby
7.
university
17.
heir
8.
lemon
18.
plane
9.
ear
19.
engineer
10.
uniform
20.
igloo