根据短文内容，从下面方框中选择适当的单词或词组填空，使短文内容完整正确。
first-aid, been turned into, helping, be able to, less expensive than
A teacher, a doctor–both jobs for 【小题1】 people. Now schools and hospitals in Marshall County, Kentucky, USA, will have more similarities (相似之处) in the “ambu-bus”. As its name suggests, the one-time school bus has 【小题2】an ambulance（救护车）, the Marshall County Tribune-Courier reported.
The “ambu-bus” will 【小题3】carry 18 patients and will be adapted (改装) to have 【小题4】features(特征). Officials say it will be very useful if they are ever faced with a major disaster. It will also be 【小题5】building a new ambulance.
Danny Davis, an official on the Kentucky board of education (学校董事会), said, “I’m a strong believer in school-munity relations (关系) and I think this would be a very good thing for us to do.”helping
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(答案→)helping
解析：这篇短文主要介绍了在美国肯塔基州马歇尔县，将一些曾经的校车改造成了救护车，这些救护车具有了一般救护车的基本特征。在遇到灾难时非常有用，并且造价也比较便宜。
【小题1】老师和医生的工作就是为了帮助别人的，本句中for是介词，后面接名词或者动名词做宾语，结合所给单词，可知填动名词helping，帮助，作宾语。
【小题2】结合语境可知此处指的是曾经的校车被改成了救护车，描述现在已经完成的动作用现在完成时态，本句主语是动作对象，故用被动语态，结合所给选项，可知填：been turned into
【小题3】结合语境可知这种救护车能够运载18名病人，联系前文助动词will及所给选项，可知填be able to，能够。
【小题4】联系上文，可知此处指的是这种车具有急救用的特征，结合所给选项可知填复合形容词first-aid，急救的，急救用的，做定语。
【小题5】联系上文，可知此处意思是，比起建造一辆新的救护车也要便宜，结合所给选项，可知填less expensive，比较便宜的。