

Sam and Tom were brothers who liked to play with cars. They had many cars of different colors and sizes. Sam liked the red car best, because it was fast and shiny. Tom liked the blue car best, because it was big and loud. They also had a black car that looked like a police car, but they did not play with it much. It was old and dirty, and it had a broken siren.
One day, Sam and Tom decided to race their cars on the sidewalk. They lined up their cars at one end, and said "Ready, set, go!" They pushed their cars as hard as they could, and watched them zoom along the pavement. Sam's red car was in the lead, followed by Tom's blue car. The black car was far behind, because it was slow and heavy.
As they reached the other end of the sidewalk, they saw a big dog lying on the grass. The dog was lazy and sleepy, and did not notice the cars coming. Sam and Tom did not see the dog either, because they were looking at their cars. Sam's red car hit the dog's tail, and the dog woke up with a loud bark. He was angry and scared, and he jumped up and chased the red car. Sam was afraid and ran after his car, hoping to get it back.
Tom saw what happened, and he had an idea. He grabbed the black car, and pushed it towards the dog. He hoped the dog would think it was a police car, and leave Sam alone. He also hoped the siren would work, and make a loud noise. He said "Let me help you, Sam!"
The black car rolled towards the dog, and to Tom's surprise, the siren started to work. It made a loud and scary noise, and the dog stopped chasing the red car. He looked at the black car, and thought it was a real police car. He was afraid and ran away, leaving Sam and Tom alone.
Sam and Tom were happy and relieved. They hugged each other, and thanked the black car. They decided to play with the black car more often, because it was brave and helpful. They also decided to be more careful, and look out for dogs and other things on the sidewalk. They learned that sometimes, old and dirty things can be useful and fun.
