1. S1: Forecasting the weather has always been a difficult business. P : During a period of drought, streams and rivers dried up, the cattle died from thirst and were ruined. Q : Many different things affect the weather and we have to study them carefully to make accurate forecast. R : Ancient Egyptians had no need of weather in the Nile Valley hardly ever changes. S : In early times, when there were no instruments, such as thermometer or the barometer, man looked for tell-tale signs in the sky. S6: He made his forecasts by watching flights of the birds or the way smoke rose from fire. The Proper sequence should be: