a or an
a sandwich
a or an
an egg
a or an
a lemon
a or an
an apple
a or an
a tomato
a or an
an onion
a or an
a pineapple
a or an
a watermelon
a or an
a biscuit
a or an
a cake
a or an
an orange
a or an
an elephant
a or an
an owl
a or an
an ostrich
a or an
a lion
a or an
an eagle
