阅读下面短文，掌握其大意，然后从各题所给的A、B、C、D四个选项中选出最佳选项，并在答案的字母标号涂黑.
Maxwell put up his hand and waited for his teacher, Mrs. Gilbert, to notice him. Do you have a 1, Maxwell?" Mrs. Gilbert asked. It's more like a problem, Maxwell said. "I lost my tooth Maxwell 2 and held out his hand to show his class his baby tooth.
Congratulations, "Mrs. Gilbert said. Then she asked the class 3 anyone had good advice for Maxwell. Chen Lu put up her hand first. She was from China. "Is it an upper or a lower tooth? "Chen Lu asked. "A lower tooth, Maxwell said. "You should 4 your baby tooth over the roof(顶部) of your house, "Chen Lu said. Why should I do that? "Maxwell asked. "5 then your new adult tooth will grow properly (恰地). When you lose an upper tooth you should put it under the floor Mrs. Gilbert thought this was a good idea, but Jorge disagreed. Jorge was from France. You shouldn't throw your baby tooth away, Maxwell. You should take your tooth home. Then you should put 6under your pillow（枕头) when you go to sleep, "Jorge said. "Why should I do that?", Maxwell asked, "Because then the tooth mouse will come. He will keep your 7and bring you good luck. The tooth mouse 8 even give you a small toy.
Maxwell preferred Jorge's advice. Mrs. Gilbert gave him a box to keep his tooth in. She didn't 9him to lose his tooth again.
Whatever you decide, you should show your mother your tooth when you reach 10"Mrs Gilbert said. OK, I will, "Maxwell smiled.
