阅读下面短文，根据第73至第75小题的具体要求，简要回答问题，并将答案转写到答题卡上。
Alongtimeago,MiltonS.Hershey,thecreatorofthepopularchocolatebars,wasdippedinwarmchocolate.Iknowallaboutit.Mygrandfatherwasthere!
Atnineteen,HersheyestablishedacandybusinessinPhiladelphia.Althoughitfailed,hetr iedagaininseveralothercitiesandsucceededwithCrystalACaramels.ButHersheywasnotcontent.Hebeganexperimentingwithchocolateandmanagedtosellhisfirstchocolatebarsin1900.Theywereaninstantsuccess.In1903,Hersheybuiltafactory.
Hersheywasusuallypleasantandkindandenjoyedagoodjoke.However,inhischocolatefactory,heheldhighstandardsforalltheworkers.Hewasbothrespectedandfeared.Hisangerwouldburstoutwhenthingsdidn’tgoashe’dexpected,andworkerswerefiredformistakes.
Mygrandfatherbeganworkinginthefactoryasayoungman.Hisjobwastopushthevats(大桶)ofwarmchocolatetoastoragearea.Todothis,hehadtopushtheheavyvatsuparamp(斜坡)andacrossthewalkway.Oneday,Hersheywaswalkingbackwardonthewalkwaywhilemygrandfatherwaspushingavatofchocolateuptheramp.Bump.Clunk.Ker-plop!Hersheyfellbackwardintothevat.Everyoneelseheldtheirbreathandranuptopullhimout.Grandfatherfrozeinfear.Washegoingtolosehisjob?
Hersheystoodstifflywithhishandsonhiships.Colorroseinhisface.Hesaidsomethinginalowvoice.Thenhesmiled.“It’snotyourfault,son,”hesaid.“IneedtowatchwhereI’mgoing.”Heputsomechocolateinhismouth.“Mmm,that’sgood,”hesaid.Everyonelaughed.Thetourcontinued,withHersheydrippingchocolateashewent.AndGrandfatherkepthisjob.
73.Whatd idGrandfatherdoinHershey’sfactory?（回答词数不超过12个）
正确答案：Hepushedthevatsofwarmchocolatetoastoragearea.
