Mr. Black lives in a small town. On the first Sunday in the new house, Mr. Black takes his new red car out of the garage (车库) and he is washing it when a neighbor(邻居) passes by. When the neighbor sees Mr. Black's new car, he says, 'That's a nice car. Is it yours?' 'Sometimes,' Mr. Black answers. The neighbor is very surprised and asks, 'Sometimes? What do you mean?' 'Well,' answers Mr. Black, 'When there is a party, it is my daughter's. When there's a football game, it is my son's. When l wash it and it looks nice and clean, it's my wife's. And when it needs gas (汽油), it's mine.