从方框中选择正确选项，完成短文（方框中有两个选项是多余的）。

A. spend       B. secret       C. eaten up       D. challenge       E. by       F. wouldn’t       G. proud       H. sold out       I. surprise       J. slept       K. well-known       L. continued

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 housework and buy some food.

After the first week, I noticed that the food was 【小题1】 very quickly. Then I began keeping an eye on my mum. To my 【小题2】, I found 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 to follow her. I saw her taking the food to the street children. She would also 【小题3】 a lot of time talking and playing with them.

One day, I talked to a neighbor and found out that my mum was 【小题4】 in the area. The children were very friendly with her and even thought of her as their own mother. Then it hit me—why 【小题5】 she want to tell me about it? Was she worried that I would stop buying food if I found out?

When my mum got home, I gave her a big hug. I told her she didn’t need to keep it a 【小题6】 from me. And she told me something about the children. Some of them lived with an old lady in a small house. Others 【小题7】 on the street. For years, she was helping the poor street children 【小题8】 giving them food. After she told me everything, I was so moved by how selfless (无私) she was. She helped others in need. As her son, I was so 【小题9】 of my mum.

I 【小题10】 to buy food for my mum after that. But I always added one more bag for her other children.