When I was young, I spent my summer vacations on my grandparents' farm. The summer that I graduated from college, I【C1】______ my grandparents once again. When I arrived, I discovered that there was a family【C2】______ in progress. Grandpa's dog and hunting partner, Rusty, had taken on a very bad【C3】______ in his old age. He had begun【C4】______ into the chicken coop(鸡笼) and eating eggs. In the eyes of the local farmers,【C5】______ dogs started stealing eggs, there was no【C6】______ to cure them. They knew there was only one thing to be done【C7】______ such a dog—you had to shoot it and the sooner the【C8】______ . Rusty and Grandpa were old friends. Grandpa certainly didn' t【C9】______ to shoot Rusty, but he knew it needed to be done. The "egg money" was Grandma' s private income, so you can imagine【C10】______ she felt about the problem.【C11】______ the inexperienced confidence of youth, I told Grandpa that I thought I could "cure" the egg-stealing dog. I wanted to at least have a【C12】______ to save Rusty' s life, and save Grandpa from the sadness of【C13】______ Rusty. The next morning, I broke open six fresh eggs and put them in Rusty's bowl【C14】______ at the door to the chicken coop. Rusty came【C15】______ and noticed the eggs. He quickly【C16】______ the eggs and happily walked off for his nap(打盹). The following morning I did the【C17】______ thing. I put the eggs a few feet away from the chicken coop, toward the back door of the farmhouse【C18】______ Grandma usually fed Rusty. The next day I again moved the bowl closer to the house, and added some dog food to the eggs. Every day I moved the bowl closer to the back door, mixing more dog food and【C19】______ eggs. By the time the bowl reached the door, it was all dog food and no eggs. Rusty had again become【C20】______ to looking for his food at the back door of the house, and never again went into the chicken coop.