(1) This is incorrect as the sentence talks about the lack of 'substantiated' roof in Galbraith's opinions. 'Cogent' and 'pithy' convey the meaning - concise. Concise will not substantiate an analysis. (2) This is incorrect as it talks of summing up or adding up the analysis. We need a word that is similar in meaning to 'substantiated'. (3) This is correct as the sentence talks about the lack of 'substantiated' roof in Galbraith's opinions. 'Statistical' and number based or 'numerical' proofs would have lent more weight to Galbraith's theories. (4) This is incorrect as it talks of accruing/ summing up or adding up the analysis. We need a word that is similar in meaning to 'substantiated'. (5) This is correct as the sentence talks about the lack of 'substantiated' roof in Galbraith's opinions. 'Statistical' and number based or 'numerical' proofs would have lent more weight to Galbraith's theory. (6) This is incorrect as the sentence talks about the lack of 'substantiated' roof in Galbraith's opinions. 'Cogent' and 'pithy' convey the meaning - concise. Concise analysis will not substantiate an analysis.

(1) This is correct as the sentence talks of refusing to be converted to 'modernism'. Hence, clinging to 'values' and 'heirlooms' makes sense. (2) This is incorrect as 'dregs' would represent the last, undesirable leftovers. It would make sense to cling to something only if it is desirable. (3) This is correct as the sentence talks of refusing to be converted to 'modernism'. Clinging to precious values and heirlooms in such a scenario makes sense. (4) This is incorrect as 'frailties' and 'infirmities' would hardly be precious. (5) This is incorrect as 'debris' or 'dregs' would represent the last, undesirable leftovers. It would make sense to cling to something only if it is desirable. (6) This is incorrect as 'frailties' and 'infirmities' would hardly be precious.