Liu Dan is a middle school student. He comes from a big city named Changsha. He is a good boy. He studies very hard. He often helps other students.    
    On a Saturday morning he went to a library. On the way he found a watch. He waited for the owner for two hours, but he couldn’t find the owner. At last he took a taxi to send it to a Lost and Found Office. He didn’t leave anything about him. He said, “It’s my duty.”
    When he went back home, it was dark. He was very tired. He knew the owner must worry a lot. So he wrote a Lost and Found on the Internet. Then he started his supper.