1. S₁: The real cause for the rise and fall of the sea level was not known to men for a long time.
S₆: So they concluded that the Moon and the tide are connected in some way.

P: They found out that the Moon is a satellite and it travels a regular path around the Earth. I
Q: As time passed and knowledge increased, men began to learn more about the heaven and the stars and the planets.
R: They noticed that the Moon rose each day about an hour later than it rose the day defore and the peak of the high tide also comes about an hour later each day.
S: Some imagined that the Earth itself was Alive and the rising and falling of the tide was caused by the breathing of the Earth's big body.

2. S₁: Gandhi's first political fast was made soon after his return from Africa.
S₆: He did not. fast against the mill owners, but in order to strengthen the determination of the strikers.

P: He had also received help from this man's sister.
Q: This was when the poor labourers of the cotton mills of Ahmedabad were on strike.
R: He was a friend of the largest mill owner.
S: Gandhi had made the strikers promise to remain on strike until the owners agreed to accept the decision of an arbitrator.

3. S₁: Politeness is not a quality possessed by only one nation or race.
S₆: In any case, we should not mock at other's habits.

P: One may observe that a man of one nation will remove his hat or fold his hands by way of greetings when he meets someone he knows.
Q: A man of another country will not do so.
R: It is a quality to be found among all peoples and nations in every corner of the earth.
S: Obviously, each person follows the custom of his particular country.

4. S₁: While talking to a group, one should feel self- confident and courageous.
S₆: Any man can develop his capacity if he has the desire to do so.

P: Nor is it a gift bestowed by providence on only a few.
Q: One should also learn how to think calmly and clearly.
R: It is like the ability to play golf.
S: It is not as difficult as most men imagine.

5. S₁: The 'age of computers' is considered to have begun in 1946.
S₆: And now it is difficult to find a field where computers are not used.

P: Those early computers were huge and heavy affairs, with problems of speed and size.
Q: It was only with the introduction of electronics that the computers really came of age.
R: But computers were in use long before that.
S: They had several rotating shafts and gears which almost always doomed them to slow operation.

6. S₁: Widowhood in India used to be specially miserable.
S₆: Today nobody looks upon remarriage of widows with disgust or disapproval.

P: There were widows even in ages ranging from five to ten.
Q: A widow was a widow always.
R: However, several communities began to rebel against the illtreatment of widows.
S: She could not marry ugain however tender in age she might be.

7. S₁: It is regrettable that there is widespread corruption in the country at all levels.

P: So there is 'hardly anything that the government can do about it now.
Q: And there are graft and other malpractices too.
R: The impression that corruption is a universal phenomenon persists and the people do not cooperate in checking this evil.
S: Recently several offenders were brought to book, but they were not given deterrent punishment.
S₆: This is indeed a tragedy of great magnitude.

8. S₁: Man has existed for about a million years.
S₆: What its future effects will be is a matter. of conjecture, but possibly a study of its effects hitherto may make the conjecture a little less hazardous.

P: Science' as a dominant factor in determining the beliefs of educated men, has existed for about 300 years; as a source of economic technique, for about 150 years.
Q: When we consider how recently it has risen to power, we find ourselves forced to believe that we are at the very beginning of its work in transforming human life.
R: In this brief period it has proved itself an incredibly powerful revolutionary force.
S: He has possessed writing for about 6,000 years, agriculture somewhat longer, but perhaps not much longer.

9. S₁: The houses in the Indus Valley were built of baked bricks.
S₆: They led outside into covered sewers which ran down the side of the streets.

P: This staircase sometimes continued upwards on to the roof.
Q: Access to the upstairs rooms was by a narrow stone staircase at the back of the house.
R: The drains were incorporated in the walls.
S: The houses had bathrooms and water closets, rubbish chutes and excellent drainage systems.

10. S₁: The path of Venus lies inside, the path of the Earth.
S₆: When at, its brightest, it, is easily seen with the naked eye in broad daylight.

P: When at its farthest from the Earth, Venus is 160 million miles away.
Q: With such a wide range between its greatest and least distances it is natural that at sometimes Venus appears much brighter than others.
R: No other body ever comes so near the Earth, with the exception of the.Moon and an occasional comet or asteroid.
S: When Venus is at its nearest to the Earth, it is only 26 million miles away.