阅读下面短文,从短文后每题所给的A、B、C、D四个选项中,选出可以填入空白处的最佳选项。
Once there was a girl, named Kate. She was very polite and ready to help everybody. One day she found a pink paper bag on the way to school. She opened it and saw there was a lot of 1in it. She thought she should hand it in to the teacher, so she 2it in her schoolbag.
When she went to the teacher's office, her teacher wasn't 3. As it was time for class, she hurried to the classroom.
After class, she told her friend, Mary, about the money that she4 Then, her greedy (贪婪的) friend took away the bag.
After school, Kate wanted to go to the5office again, but she found the money was missing.
The next day when the children were playing a game, Mary fell down and was hurt very badly. The other children stood around her and didn't know6to do. Kate kept calm and did something to stop bleeding. She told the others to go to teachers for7.Soon a teacher took Mary to the 8and the doctor examined her carefully. Within a week she was all right again. Kate became very popular in the school.
Two weeks later Mary came to Kate house. Her eyes were red. She was crying. She gave Kate the 9paper bag with the money in it and said. “Kate, I have taken the money away. That day when you helped me, I felt very sad and now I decide to tell you the10, you are such a nice friend! 11, please don't tell the school about this please!” then Kate said, “you are now12, but you have done a bad thing. Though I will not tell anyone, I want you not to be greedy and13 to do anything wrong.” The girl thanked Kate and14.
At the end of the term Kate was given a 15for being a very helpful girl in the school. Mary became an honest girl and was never greedy again.
Once wrong, never be wrong forever.