用方框中所给词的适当形式填空，使短文完整、通顺。
| many one real help hand |
Like many kids, Alan is a fan of science. But this 14-year-old eighth-grader used his science skills 1 ． others. He created three prosthetic ( 假体的 ) 2 ． using a 3D printer during his after-school program. He designed the 3 ． hand for practice. The second one was designed for a 6-year-old boy, and the third was made for a disabled teacher at his school. Combining his love of science and his willingness to help others ， Alan plans to make one 4 ． hand before the year ends. He 5 ． wants to do something good and helps more people.
1 ． to help
2 ． hands
3 ． first
4 ． more
5 ． really
【分析】
本文讲述了一位 14 岁的孩子用自己的科学技术帮助他人的故事。
1. 句意：但是这个 14 岁的八年级学生用他的科学技能来帮助别人。根据 “used his science skills…others” 及 “his willingness to help others” ，可知，用这些技能帮助其他人， use sth to do sth“ 用某物做某事 ” ，故填 to help 。
2. 句意：在他的课余项目中，他用 3D 打印机制作了三个假肢手。根据 “hand” 可知，是制作了三个假肢手， three 修饰复数名词，故填 hands 。
3. 句意：他设计了用于练习的第一只手。根据 “He created three prosthetic hands…” 及 “The second one”“the third” 可知，此处介绍第一只手的作用，故填 first 。
4. 句意：艾伦计划在年底前再做一只手。根据 “ one… hand” 及备选词，可知，此处用基数词 +more+ 单数名词，表示 “ 再 …… ，又 ……” ，故填 more 。
5. 句意：他真的想做一些好事，帮助更多的人。此句不缺少任何结构，应填副词作状语。备选词 real 的副词 really“ 真的 ” 符合，故填 really 。