a or an
egg
an egg
box
a box
rat
a rat
dog
a dog
school
a school
orange
an orange
cat
a cat
teacher
a teacher
elephant
an elephant
ox
an ox
girl
a girl
robot
a robot
apple
an apple
arm
an arm
ant
an ant
fish
a fish
CD
a CD
book
a book
notebook
a notebook
ear
an ear
umbrella
an umbrella
fox
a fox
table
a table
tree
a tree
chair
a chair