A:用肥皂水可检验水的硬度
B:用柠檬酸、果汁、白糖、水、小苏打等制汽水
C:用热纯碱溶液除去铁锅表面的铁锈
D:用酒精浸泡捣烂的某些植物的花瓣可制酸碱指示剂
My grandfather would be fine for a while, but would then fall suddenly ill and have to________the hospital.