阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。
An old farmer was about to die. He wanted to make    that his sons would stop fighting among      (they).He hoped to encourage them to manage the farm      (success).The old man called his sons together and said, “My sons, I’m about     (leave) this life. You will find all that I have in the farm.”
Some time later, after their father had died, the sons started to spend long hours   (work) in the fields. They thought their father    (bury) a treasure in the ground. They kept   ploughing from morn till night, turning the soil over again and again,       still failed to find any treasure. That year’s crops, however, were     (good)than any of their father’s crops and sold for      very good price.    the end, the young men found that working hard is truly a treasure in itself.