S1 : Science has already conferred an immense born on mankind by the growth of medicine.

S6 : The general death rate in 1948 (10-8) was the lowest ever recorded up to that date.

P : It has continued ever since and is still continuing.

Q : In the eighteenth century people expected most of their children to die before they were grown up.

R. In 1920 the infant morality rate in England and Wales was 80 per thousand; in 1948 it was 34 per thousand.

S : Improvement began at the start of the nineteenth century, chiefly owing to vaccination.

The proper sequence should be 

S1 : Wordsworth knew the behaviour of owls in the night better than most of us know the ways of black birds in day time.

S6 : His great poetry owes much to the night.

P : Out of school there were no restrictions on the hours he kept.

R : He would skate by the light of the stars, snare woodcocks at dead of night, watch the sunrise after a long ramble.

S : Throughout life he was an inveterate walker by night.

The proper sequence should be

S1 : My office sent an urgent email asking me to return.

S6 : It was evening before I could sit and write to my parents that I would be joining them soon.

P : I immediately replied requesting a few days of grace as I had to book the return passage, pack and attend sundry matters before winding up my establishment here.

Q : On the way, I went to the laundry and made sure I would get my clothes in time.

R : Then I rushed to the bank, collected all my money and made reservations for my return journey.

S : From the shop next to it, I bought a couple of trunks to dump my books and other odd articles so that I could send them away in advance.

The proper sequence should be

S1 : In our youth we are apt to think that applause and publicity constitute success.

S6 : So let us be initiated into the mysteries of maturity and be taught how to resist and spurn the lure of hollow shows.

P : The man who values the applause more than his own effort has not outgrown his youth.

Q : It is our achievement or work which wins lasting rewards.

R : But these are only the trappings, the ephemeral illusions.

S : One should concentrate on one's work knowing that applause will come unsought.

The proper sequence should be

S1 : Human ways of life have steadily changed.

S6 : Even if we try to do nothing, we cannot prevent change.

P : Ancient Egypt - Greece - the Roman Empire - the Dark Ages and the Middle Ages - the Renaissance - the age of modern science and of modern nations one has succeeded the other; the history has never stood still.

Q : About ten thousand years ago, man lived entirely by hunting.

R : A settled civilized life only began when agriculture was discovered.

S : From that time to this, civilization has always been changing.

The proper sequence should be 

S1 : Good memory is so common that we regard a man who does not possess it as eccentric.

S6 : She wheeled away the perambulator, picturing to herself his terror when he would come out and find the baby gone.

P : I have heard of a father who, having offered to take the baby out in a perambulator, was tempted by the sunny morning to pause on his journey and 

slip into a public house for a glass of beer.

Q : A little later, his wife had to do some shopping which took her past the public house where to her horror, she discovered her sleeping baby.

R. Leaving the perambulator outside, he disappeared into the drink shop.

S. Indignant at her husband's behaviour, she decided to teach him a lesson.

The proper sequence should be