It's ____ alien.
an
/
a
There is ____ train.
/
a
an
They're ____ balloons.
an
/
a
Santa has ____ bike.
a
/
an
It's ____ ball.
a
/
an
They're ____ boats.
a
/
an
I have ____ robot.
an
a
/
In American English, we say ...
truck
lorry
There is ____ doll.
a
/
an
There is ____ car.
a
/
an
They're playing _____ board game.
a
an
/
It's ____ teddy bear.
an
/
a