LindaandDavidhavetraveledbyairfromLondontoSydney,Austra...
問題詳情：LindaandDavidhavetraveledbyairfromLondontoSydney,Australia．Lindahaspromised（答應）hermotherthatshewillringhertoletherknowthattheyhavearrivedsafely．Thisissomethingshehaddoneeversinceshewasachild．Davi...