One day, a farmer took his horse to the town for sale and hoped to bring some money home. On his way he saw an old woman. She looked weak, so the farmer carried her on his horse. Before the woman said goodbye, she gave the farmer a ring. She told him that the ring had magic power(魔力) and could make any dream come true. But he could make only one wish.

Later the farmer sold his horse and began to walk home. Then he met an old friend and went to his friend's house to take a rest. After drinking some wine, the farmer talked to his friend about the ring. The friends asked him to drink more wine to celebrate his good luck. The farmer drank too much and then fell asleep. The friend took the ring away and put another one in its place. After the farmer woke up and left, the man took out the ring and said, "Fill the house with gold."

    Lots of gold fell down like heavy rain and killed the man. When the farmer got home, he thought he should wait until his children grew older to decide what wish was the best. So he hid(藏) it behind his house and forgot about it after several years.

根据短文内容，回答下列问题。