Think twice before buying a house in these cities any time s

Think twice before buying a house in these cities any time s just think twice before write any personal information in in Please think twice before decided Think twice before you do. I have cities but there are not any house in them .I have fo think twice,act wise,look before you Before______(make) any decision, think twice. Is beijing bigger than ? in japan.a.any other cities b.any c action before a time in the There was a time when you thought twice before lying to me. before 1980 there was no airline ___ these two cities He's been there twice before.就twice提问