Last year, I worked in a middle school near my mother's house, and I stayed with her for a month. During that time, I helped her do some (家务活） and buy some food.
After the first week, I noticed that the food was eaten up very quickly. Then I began keeping an eye on my mum. I was so （惊讶的）to find that she would put some of the food into a paper bag and go out with it at about nine every morning. And finally, I decided （跟着）her. I saw her taking the food to the street children. She would also spend a lot of time talking and （玩耍）with them.
One day, I talked to a （邻居） and found out that my mum was well-known in the area. The children were very friendly with her and even thought of her （当作） their own mother. Then it hit me—why wouldn't she want to tell me about it? Was she worried that I would stop buying food if I found out?
When Mum got home, I told her she didn't need to keep it a (秘密）from me. And she told me something about the children. Some of them lived with an old lady in a small house, and the（其他的）children slept on the street. For years, she was helping the poor street children by giving them food. After she told me everything, I was so moved by how great she was. She helped them in need. Being her son, I took (骄傲）in my mum.
I （继续） to buy food for my mum after that. But I always added one more bag for her.
