S1: The machines that drive modern civilisation derive their power from coal and oil.

S6: Nuclear energy may also be effectively used in this respect.

P: But they are not inexhaustible.

Q: These sources may not be exhausted very soon.

R: A time may come when some other sources have to be tapped and utilised.

S: Power may, of course, be obtained in future from forests, water, wind and withered vegetables.

The proper sequence should be:

General Ability 2015 NDA General Ability 2015 NDA 2015

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