7 - Seven

A or an

an + vowel sound
a + consonant sound

This is a camera.
This is an umbrella.
This is a hairbrush.
This is a cell phone.
This is a marker.
This is an eraser.
This is a plane.
This is a red dress.
This is an ear.

Correct:

a nose
a finger
an Indian
an organge soap
a door
a plant