One day, mom and dad went shopping. Xiao Ming was at home and concentrated on his homework. Suddenly, Xiao Ming heard a knock on the door. Xiao Ming asked, "who is that?" the uncle said, "I'm your dad's friend. I have something to look for him.". "Xiao Ming stood on the stool and saw a strange uncle standing stealthily outside the door. Xiao Ming thinks I'm alone at home, and I can't open the door to strangers.
So Xiaoming said to his uncle outside the door, "call my father first, and he will be back soon. "My uncle walked away in dismay.