阅读下面短文, 从短文后所给的A、B、C、D四个选项中选出能 填入相应空白处的最佳选项。Jeff was a poor farmer and he was short of money. His neighbours were rich and he was jealous(忌妒的) of them. Because of this, he didn't 1 his neighbours. Jeff had a vegetable field to 2 his family. As he grew old, he found it very 3 to work in the field as he had no bull toplow(犁) the field.
One day, Jeff was returning home from the 4 . On his way, he met an old man. Seeing Jeff, the old man said," What's the matter? You seem very sad."
Jeff said," Everyone around me has everything and is rich. If I had a bull, I could 5 plow the field."
The old man gave his bull to Jeff and said," This bull is yours now. Take it home. After reaching home, you must send one of your 6 to me."
Jeff felt surprised and asked," Why do you want to 7 my neighbour?"
The old man said he wanted to give the neighbour two bulls. Hearing this, Jeff was angry." He has everything. If you give two bulls to him, I won't even want this one," he said.
The old man laughed," Do you know what your 8 is? It's not poverty(贫穷) but jealousy. If you were 9 with what you have; you would probably become the happiest person in the world."
At that time, Jeff realized his problem. He 10 that he would never get jealous of others.