2.只允许修改10处，多者（从第11处起）不计分。

Mr. Johnson lived in the woods with his wife and children. He owned a farm, that looked almost abandoned. Luckily, he also had a cow which produced milk every day. He exchanged the milk with other food. The cow was their only means of support. One day, the cow was eating grass while it began to rain heavily. While making efforts to run away, she falls over the hill and died. Then the Johnsons had to make the living without the cow. In order to support his family, Mr. Johnson began to plant vegetable. Since the plants took a while to grow it, he started cutting down trees to sell them. Thought about his children’s clothes, he started growing cotton too. When harvest came, he was already selling vegetables and cotton m the market where people met regular. Now it occurred him that his farm had much potential and that the death of the cow was a bit of luck.