Jack is twenty years old. Two years ago, when he finished middle school, he found work in a shop. Usually he works until ten o’clock in the evening. He is very tired when he gets home. After supper, he goes to bed early. His grandma lived downstairs and was satisfied with(满意) him.

One day, on his way home, he met Mary. They were both happy. He asked the girl to go to his house. And he bought some fruit and drinks for her. They talked about their school, teachers, classmates and their future. They talked for a long time.

“Have a look at your watch, please!” said the girl.“What time is it now?”

“Sorry, something is wrong with my watch,” said Jack.

“Where’s yours?”

“I left it at home.”

Suddenly, Jack began to stamp(踏) his foot on the floor, “Bang! Bang! Bang!”

The sound woke his grandma up. The old woman shouted downstairs, “It’s twelve o’clock in the night, Jack. Why are you still jumping upstairs?”