(1) This is correct as the author speaks of 'essential' consciousness. “Supplemental' consciousness provides the needed differentiation and 'extended' provides the similar word. (2) This is correct as the author speaks of 'essential' consciousness. “Extended' consciousness provides the relevant contrast and 'supplemental' provides the similar word. (3) This is incorrect as 'exacerbating' means 'aggravating', and the word does not fit in the sentence. (4) This is incorrect as 'exacting' would imply 'something difficult', which would not fit in the sentence. (5) This is incorrect simply because 'protracted' has a negative connotation, while 'extended' and 'stretched' do not. (6): This is incorrect simply because there is no matching word among the options.

(1) This is incorrect as the use of 'and' after insult suggests continuation of the tone. 'Exaltation' and 'approbation' are opposites of insult. (2) This is incorrect as the sentence ends on a note of derision for 'self-interest' of Robert Black. Hence, 'altruism' or 'selflessness' cannot be the appropriate words. (3) This is incorrect as the use of 'and' after insult suggests continuation of the tone. 'Exaltation' and 'approbation' are opposites of insult. (4) This is correct as 'vitriol' correctly conveys a continuation of the emotion of insult. Also, there is a similar word in 'virulence'. (5) This is correct as 'vitriol' correctly conveys a continuation of the emotion of insult. Also, there is a similar word in 'virulence'. (6) This is incorrect as the sentence ends on a note of derision for 'self-interest' of Robert Black. Hence, 'altruism' or 'selflessness' cannot be the appropriate words.