Directions: The following passage consists of six sentences. The first and sixth sentences are given in the beginning as S1 and S2, respectively. The middle four sentences in each have been jumbled up. These are labelled P, Q, R and S. You are required to find out the proper sequence of the four sentences and indicate your answer accordingly.
S1: The twentieth century seems to us a glorious age and we pride ourselves on its achievements. S2: The wonders and miracles of science would justify us in paying a tribute to modern civilisation. P: The science has made tremendous progress in machinery. Q: Electricity is serving us in thousand ways like in transport. R: Railways, ships and airplanes have reduced distances and made travel fast and comfortable. S: The use of machines and electricity in industry has eliminated human labour.