Mr. Johnson lived in the woods with his wife and children. He owned __61 __farm，which looked almost abandoned.__62 __(lucky)，he also had a cow which produced milk every day. He sold or exchanged some of the milk in the towns nearby __63__other food and made cheese and butter for the family with what __64__(leave)．The cow was their only means of support，in fact. One day，the cow was eating grass __65__it began to rain heavily. While making great efforts to run away，she __66__(fall) over the hill and died. Then the Johnsons had to make a living __67__the cow. In order to support his family，Mr. Johnson began to plant herbs and vegetables. Since the plants took a while to grow，he started cutting down trees __68__(sell)the wood. Thinking about his children's clothes，he started growing cotton too. When harvest came around，he was already selling herbs，vegetables and cotton in the market __69__people from the towns met regularly. Now it occurred to__70__that his farm had much potential and that the death of the cow was a bit of luck.