某些植物的花汁可作酸碱指示剂。取三种花汁用稀酸溶液或稀碱溶液检验，颜色如下：

试回答下列问题：    

(1) 为试验生活中的食盐水、肥皂水、汽水、石灰水四种物质的酸碱性，我选择  ____  花汁，不选用其他花汁的原因是                                。

(2) 取所选花汁少许分别滴人上述四种物质，请将所显颜色填入下表中：

A huge forest fire _____ after the lightning struck, but luckily no one died or got hurt. [ ]

A. broke out

B. broke up

C. broke down

D. broke off