Here's a short story using the words and phrases you provided. This story is simple and suitable for a 6th grader:
Title: The Wicked Thief
Once upon a time, in a small town, there lived a wicked thief. Everyone knew he was a criminal, but they were too afraid to say anything. One night, the thief decided to steal from the biggest house in town.
As he crept quietly into the house, he thought, "This will be so easy! Those people are stupid for leaving their door unlocked." Just as he was about to take a gold necklace from the table, a loud noise startled him.
A little girl, who was sleeping in the next room, woke up and began to scream at the top of her voice, "Help! There is a thief in my house!"
The thief was shocked. He quickly ran out of the house, but not before the girl’s parents heard her cries. They rushed downstairs and saw the thief escaping into the night.
Thanks to the brave little girl, the town learned about the wicked thief and decided to keep a closer eye on their homes. From that day on, the thief was never seen again!
This story contains all the required words and phrases and is written at an appropriate level for a 6th grader.