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(71) . Materials for rain proof coats and tents owe their water proof properties to:

(72) . Internet was first developed in:

(73) . Which of the following is not part of the G7?

(74) . Correct meaning of the idiom "There is no smoke without a fire" is:

(75) . Who was the commander of infidels in the battle of Ditch (Khandaq)?

(76) . Which of the following layers absorbs most of the sun's ultraviolet radiation?

(77) . . If Als two years older than B and B is twice as old as C. If the sum of the ages of A, B and C Is 27 then how old is B?

(78) . One kilometer is equal to how many miles?

(79) . Z.A Bhutto was author of the following book:

(80) . Change the Voice of the following sentence: Does she write a letter?