设有学生表student，包含的属性有学号sno、学生姓名sname、性别sex、年龄age、所在专业smajor。下列语句正确的是______。
D
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When_______,waterwillbeturnedintosteam.
Policeare________thedisappearanceoftwochildren.
Onecanfigureoutthemeaningof“airmail”tobe“mailbyair”byits______.
Ithasbeenyears________Ireturnedhome.
Basically，theseattitudesamounttoabelief________leisurecanandshouldbeputtogooduse
