The money in the composition savings box is empty.

Wenwen has a savings box, and he usually puts money he doesn't need in it. But it is often saved today and used tomorrow, so it is always empty. But recently, for some reason, the savings box has become more and more full and heavier. Who knows that the good times won't last long? One day, my mother went to shake Wenwen's savings box. She was dumb. Dad weighed the piggy bank, which was very light. Where did the money go? A cloud of doubt hung over their brows. They decided to test their writing. ...

When Wen Wen came home from school, his father said to Wen Wen in a "provocative" way: "Wen Wen, are you hungry when you come back from school?" Mother also quickly said, "son, today is Friday." Relax at the weekend. Didn't you say you would treat us to dinner with the money in your savings box on Friday? " I must cash it today. ""Did I say that? I don't remember. I ... I ... "Wenwen pretended to be confused, but he was embarrassed. Mother said, "Why did you cheat?" "Please please, I can't afford you. Dad, mom, let's go to a restaurant for dinner. "

They went to a restaurant and wanted to go in, but mom saw Wenwen still moving forward, so she looked at her wallet and ran to Wenwen and said, "Son, even if I invite you to dinner today, you don't have to invite me." Wenwen quickly said, "No, I mean it." Later, their family had dinner in a small house in a hotel. Who knows that after the lights were turned off, the restaurant owner took out his birthday cake and went in to sing "Happy Birthday to you". Then, the hotel owner turned on the light again. This shocked mom and dad. Mom said to the boss, "Whose birthday is it today, not ours!" " "WenWen's father also nodded. The owner of the restaurant quickly said, "Isn't today your birthday?" He pointed to Wen Wen and said to his mother, "Wen Wen will come to me every day after school and give me the money in his savings box." This cake is made for your birthday today. " After that, my mother quickly held Wenwen tightly in her arms and said excitedly, "My child! You finally grew up! "