Discussion
Select the most appropriate option to fill in the blanks. There can be several ______ of indoor air pollution. Tobacco smoke is one of the ______ important air pollutants in closed places. 'Passive smoking' or environmental tobacco smoke (ETS) pollution can lead to all the harmful ______ of tobacco smoking seen in the smokers in their non-smoking companions. The children of smoking parents are among the worst ______ persons.
Answer: D
The right choice is sources, most, effects, affected. 'Several sources' is a countable plural, 'one of the most important' is the superlative form that the sentence needs, and 'harmful effects' needs the noun 'effects', since 'affects' is a verb. 'The worst affected persons' needs the adjective 'affected', not 'effected'. 'Many' and 'much' fail in the second blank, and 'affects' or 'effected' fail in the last two. Among the options, only the fourth keeps all four blanks grammatical: 'sources' (plural noun), 'most' (superlative), 'effects' (noun) and 'affected' (adjective).
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