A、Both thE olD AnD thE young shoulD rEspECt EACh othEr.
B、thE youths shoulD Follow thE instruCtions oF thEir ElDErs.
C．olD pEoplE shoulD kEEp up with thE youths.
D．thE youths shoulD FurthEr thEir stuDiEs ABout wEstErn CivilizAtion.