根据所给汉语意思，用合适的单词填空。

小题1:My uncle is going _________(在国外) to study English next month. 

小题2:Mary’s father works hard to __________(改善) their lives.

小题3:Many __________(生意) people find a chance to make money in the seaside city.

小题4:The __________(亲戚) were so bad that they didn’t want to look after the two children..

小题5:Later we ____________(意识到) the importance of protecting the environment.

下列物质的用途利用了中和反应原理的是（　　）

①用稀硫酸除铁锈  　　　　 ②用氯化钠配制生理盐水

③用生石灰作食品干燥剂     ④用氨水涂抹蚊虫叮咬（蚁酸）处进行止痒

⑤用氢氧化钠溶液处理石油产品中残留的硫酸．

A．③④

B．②④

C．②⑤

D．④⑤