1. After having _______ arguments virtually every other day, the couple agreed that it was best for them to separate.   acerbic   saturnine   astringent   effulgent   assiduous   Hint Hint       2. Any increase in coal-fired furnaces beyond a particular level necessitates greater _______ the fossil fuels; thus, the capability of an economy to effectively manage energy resources depends partially on _______ the number of industrial fired heaters.   trust in..enhancing   yield from..conforming   expenditure on..budgeting   recourse to..restricting   depletion of..renewing   Hint       3. It is economically beneficial to increase the capacity of an industrial plant when the revenue can be increased without a _______ increase in the cost of production.   compliant   warranted   precarious   commensurate   controlled   Hint       4. The educational system had _______ over a period of time when the authorities got preoccupied with petty politics and did not bother to update the curriculum.   adulterated   underscored   relegated   burnished   ossified   Hint       5. Nature has an apparently _______ source of plants that can be fruitfully exploited for the herbal cure of many diseases.   insatiable   indefatigable   insuperable   inexhaustible   iniquitous   Hint       6. Although there was hardly any scope to find fault with the minister's cautiously worded response, several members of the opposition took _______ it.   pleasure in   exception to   advice from   liking for   liberties with   Hint       7. Although several critics denounced his _______ techniques, there was unanimous praise for his _______ performances over the last season.   unorthodox..unexceptionable   anomalous..apocryphal   innovative..mediocre   precarious..unexceptional   laudable..internecine   Hint