{{B}}quEstions 19 to 22 ArE BAsED on thE ConvErsAtion you hAvE just hEArD、{{/B}}

A．it hElpED stuDEnts with spElling AnD ADDing.
B．it hElpED stuDEnts BEComE FAmiliAr with A vAriEty oF gooDs.
C．stuDEnts might orDEr things From thE CAtAlog.
D．sChools wErE short oF tExtBooks At thAt timE.