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     It's very cold outside. There comes a black car and it stops in front of a shop. A young woman is in the car. She is hungry and wants to buy a hamburger to eat, but she doesn't want to go out on such（如此）a cold morning. At that time, she sees a boy playing in the street. "Come on, boy!" she says to the boy. " Do you know how much a hamburger is in the shop?"" Two yuan each, "the boy answers. She gives the boy four yuan and asks him to buy two hamburgers. One is for you and the other is for me, "she says. After some minutes, the boy comes back. He is eating a hamburger. He gives the young woman two yuan and says, "Sorry, there is only one hamburger left."