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Tom likes fish very much. He often buys some fish and takes it home. But when his wife sees the fish, she says to herself, "Good! I can ask my friends to have lunch, and we can eat the fish. They like fish very much."

One day Tom brought some fish home and then went out. When Tom came home in the evening, the fish wasn't there. His wife Sally said, "Oh, your cat ate it." And she gave him some bread as his supper. Tom was very angry. He weighed(称重)the cat in a shop with his wife. Then he turned to Sally and said, "My fish weighs one kilo(千克). This cat weighs one kilo, too. The cat is here, you see, but where is my fish?"