Wisebuyingisapositivewayinwhichyoucanmakeyourmoneygofurther.The（）yougoaboutpurchasinganarticleoraservicecanactually（）youmoneyorcanadd（）thecost.Takethe（）exampleofahairdryer.Ifyouarebuyingahairdryer,youmight（）thatyouaremakingthe（）buyifyouchooseone（）lookyoulikeandwhichisalsothecheapest（）price.Butwhenyougetithomeyoumayfindthatit（）twiceaslongasamoreexpensive（）todryyourhair.Thecostoftheelectricityplusthecostofyourtimecouldwell（）yourhairdryerthemostexpensiveoneofall.Sowhatprinciplesshouldyou（）whenyougooutshopping?Ifyou（）yourhome,yourcaroranyvaluable（）inexcellentcondition,you’llbesavingmoneyinthelong（）Beforeyoubuyanew（）,talktosomeonewhoownsone.Ifyoucan,useitorborrowittocheckitsuitsyourparticular（）Beforeyoubuyanexpensive（）,oraservice,docheckthepriceand（）isonoffer.Ifpossible,choose（）threeitemsorthreeestimates.请在第（）处填上正确答案。

A. what
B. which
C. that
D. this