Thesedays,moreandmorepeopleare_________(did/do/doing)theirshoppingonline.Oneofthebestthingsaboutonlineshoppingisthatitis________(convenient/risky/fake).Youcanshopanywhereandanytime.Sometimesyoucanfindthingscheaperonlinetoo.However,thereareconsofshoppingonline.Ontheonehand,youmayneed_________(paying/pay/topay)extrashippingcosts.Ontheotherhand,whenyoubuythingsonline,youneedtomwaittoo. Youwon'tgetthe______(refundpolicy/item)immediately,andwhenitfinally__________(arrives/arrived/arriving)，itmaybedifferenttowhatyouexpected.