 
Once upon a time, there lived a boy named Jack. He was three years old and loved to explore the world. He had many questions in his mind. One day, Jack's mom asked him to take care of the house while she went to the underground to get groceries. 
Jack obediently said yes and started to do some activities around the house. While Jack was inside, he heard some strange noises coming from outside. He peered through the window and saw a creature he had never seen before. 
Jack opened the door and asked the creature, "What are you?" The creature smiled and said, "I'm an underground monster. Don't be scared. I'm just here to visit and check out your backyard."
Jack thought the creature was normal and he invited him to play. The two of them had a great time, playing tag and other games. Jack's mom returned from her errand and saw her son minding the creature. She smiled and said, "Yes, Jack. You did a great job looking after our guest."
