S 1 : The motor car is one of the useful gifts of modern science. P: One of these is the smoke and pollution that it creates. Q: It has made short and medium distance journeys fast and comfortable. R: The other is that it has made journey by road hazardous. S: Yet we can't say that a motor car is a blessing without disadvantages. S 6 : Finally in this age of energy crisis a personal car is an expensive thing. The Proper sequence should be: