星期天，小明的爸爸和妈妈去加班了，只剩下小明一个人在家写作业。“咚咚”有人在敲门。咦？爸爸和妈妈说了晚上才能回来。如果工厂停电不上班，那爸爸妈妈都有钥匙，敲门的人会是谁呢？”小明很纳闷，于是他来到门口，问道：“谁呀？”
On Sunday, Xiao Ming's father and mother went to work overtime, leaving Xiao Ming alone at home to do his homework. Someone is knocking at the door. Why? Dad and mom said they would come back at night. If the factory is out of power and doesn't work, then mom and dad all have keys. Who will knock at the door? " Xiaoming was very puzzled, so he came to the door and asked, "who is it?"
“我是你爸爸的朋友。”门外的人答道。
"I'm your father's friend." Answered the man outside.
小明一听刚去开门，突然把手缩了回来。他想：开门怕是坏人，不开门，又可能真是爸爸的朋友。他灵机一动，说：“我爸爸不在家，请您把手机号码留下。”那人说完电话号码就走了。小明说：叔叔，再见！”
As soon as Xiao Ming heard that he had just opened the door, he suddenly withdrew his hand. He thought: I'm afraid it's a bad person to open the door. If I don't open the door, I may be my dad's friend. "My father is not at home, please leave your mobile number," he said The man said the number and left. Xiao Ming said, "goodbye, uncle!"