{{B}}quEstions 27—30{{/B}}

A、DEvEloping nEw ADvErtisEmEnts For olD proDuCts.
B、EDuCAting pEoplE ABout nEw proDuCts.
C、DEsigning usEFul proDuCts For pEoplE in nEED、
D、mAking A proFit in thE mArkEtplACE.