Identify the one underlined word or phrase (A,B,C.D) that must be changed in order for the sentence to be correct.

To become Psychology mature, one has to develop an individual way of life distinguished from a mere identification with collective standards.

An intellectual is one who is enlightened; and being an enlightened person, he has to give light to others who are in need of it. In every society, we find intellectuals such as philosophers, scientists, scholars, writers, and critics; and they, as enlightened men, have a great responsibility towards society. In a society, all cannot be intellectuals. If a time comes when all are intellectuals it would be a blessed time indeed; but intellectuals have the great responsibility of guiding others on to the right path. If today we have our civilisation and culture, if we have orders and security in life, and if our life is better that that of our primitive ancestors, it is because the intellectuals, from time to time, have been guiding humanity on the path of felicity and amity. Therefore, the intellectual should come out of his ivory tower and try to elevate others to his level."

What does the phrase 'ivory tower' in the extract denote?

Choose the word or phrase (A, B, C, D,) that is closest in meaning to the underlined word in the sentence: Modern printing equipment quickly turns out duplicate copies of textual and pictorial matter.

The phrase 'with flying colours' means___________

In order to to avoid earthquake hazards , civil engineers had better ____ soil before making high -rise buildings.