[解析]
(1)America.细节理解题, many people have three names"可知,故答案为:America.
(2)Alan Brown or Alan.细节理解题."可知,故答案为:Alan Brown or Alan.
(3)grandfather.细节理解题, so he use J."可知,是为了记住这个男孩的祖父.
(4)middle name.根据第三段"You don't have the middle name,中国人的名字里没有中间名.
(5)learn Chinese.根据第三段"I hope you can help me learn Chinese,本文介绍了这个男孩希望他的新朋友能帮助他学习汉语.