Select the most appropriate option to fill in the blanks. There can be several…
2023
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.
- A.
sources, many, effects, affected
- B.
sources, much, effects, affected
- C.
sources, most, affects, effected
- D.
sources, most, effects, affected
Attempted by 19 students.
Show answer & explanation
Correct answer: D
Correct fill: sources, most, effects, affected
Blank 1 — sources: 'There can be several sources of indoor air pollution.' 'Sources' is a plural countable noun that fits with 'several'.
Blank 2 — most: the sentence requires the superlative 'one of the most important'. 'Many' would not follow 'one of the' naturally, and 'much' is used with uncountable nouns or different constructions, so it is incorrect here.
Blank 3 — effects: this blank needs a noun meaning outcomes or consequences. 'Effects' is correct. 'Affects' is a verb and does not fit grammatically.
Blank 4 — affected: 'affected persons' means people who suffer the harmful effects. 'Effected' is a verb meaning 'brought about' and is incorrect here.