根据短文理解。聪明A、B、C、D四个选项中选择最佳答案填空。

    It is raining outside. A bus 1 at a small bus stop. A man 2 out of the window. He sees a woman. She is selling 3. The man wants 4 a cake. But he doesn't want to go out because it is raining. The man sees a boy. The boy is 5 the window. “Come here, boy, ” the man says, “Do you know 6 the cake is?” “Twenty fen. ” the boy says. The man 7 the boy forty fen and asks him to buy two cakes. “One is for you and 8 is for me, ” he says to the boy. After 9 minutes, the boy comes back. He 10 a cake. He gives the man twenty fen and says, “Sorry, there is  only one cake left. ”