阅读下列短文，然后从每小题A、B、C、D四个选项中选出能回答所提问题或完成所给句子的最佳答案。

    Jim is ten years old. One day, his friend Tom says to him, "I'm going to have a birthday party on Saturday. Jim, can you come to my party? ""I'll be glad to, " answers Jim.

    Before Jim goes to the party on Saturday afternoon, his mother says to him, "Now, Jim, don' t forget to be polite(礼貌的）. Don't ask for food until someone gives it to you."

     "All right, Mum," Jim answers and he goes to Tom's house on his new bike. There are a lot of children at the party. They play together for an hour. Then Tom's mother gives them some food. But she forgets（忘记） to give Jim any. He waits（等候）politely for ten minutes and then he holds（举起） his plate（盘子） up in the air and says loudly（大声），"Does anyone want a nice and clean（千干净的） plate? "