提示：Lucy要去艺术展览中心，向一位男士问路，该男士告诉她如何前往。（L=Lucy;S=Sir）L:Excuseme,sir._____（51）theArtExhibitionCentre?S:Yes,butitisquitefar.It'saboutanhour'swalk.Youcantakeabusthe~L:_____（52）S:YoucantakeBusNo.15.L:_____（53）？S:About20minutes.Andyoucanalsotakeataxi.L:Taxi?That'sagoodidea.Thankyouverymuch.S:_____（54）L:Goodbye.S:_____（55）_____.54填_______