Exercise (articles)

A little girl was sitting on the front porch, when a stranger came up to the gate. He tried to open it, but the gate wouldn't open.
"Is your mother at home?" asked the stranger.
"Yes sir, she is always at home." said the child.
The stranger jumped over the gate and rang the a doorbell. He waited. The door remained closed. He turned to the child... "We live four doors down the street" replied the girl.

Whether correctly or not Did I use  the articles correctly?