On a winter afternoon, a friend and I were throwing stones onto the roof of the old lady's house. The object of our play was to observe how the stones changed to missiles（导弹）as they rolled to the edge of the roof. I found myself a perfectly smooth rock and threw it out. The stone was too smooth, however, so it slipped from my hand as I let it go and headed straight not for the roof but for a small window on the old lady's back porch. At the sound of crashed glass, we knew we were in trouble and ran away.
I was too frightened of getting caught that first night to be concerned about the old lady with the broken window in winter. However, a few days later, when I was sure that I hadn't been discovered, I started to feel guilty for her misfortune. She still greeted me with a smile each day when I gave her the paper, but I was no longer able to act comfortable in her presence.
I made up my mind that I would save my paper delivery money,
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