Bob likes eating fish very much. One day his wife bought a fish and took it home. When he saw the fish, he was very happy,"Good! We can have the fish for dinner." When Bob came back

 

　　Home in the evening, he found no fish at all. His wife said, "Oh,the fish was eaten up by the cat." And she gave Bob some bread for supper. Bob was angry. He took the cat and his wife to the shop nearby and weighed the cat. Then he said to his wife, "It is one kilo and the fish is also one kilo. The cat is here. But where is my fish?"