Choose the best option to complete each sentence, then check your answers.
The more rigorous the methodology applied in clinical trials, ___ reliable the resulting epidemiological data will be.
In proportional comparative structures ('The [comparative]..., the [comparative]...'), both clauses must begin with 'the' followed by a comparative form. Option 1 omits the required article 'the', while option 2 incorrectly uses a superlative.
For high-stress academic environments, continuous qualitative assessment is often considered preferable ___ traditional end-of-year examinations.
Latin-derived comparative adjectives such as 'preferable', 'superior', and 'inferior' take the preposition 'to' rather than 'than'. Option 0 ('than') is a common error caused by overgeneralizing standard comparative rules.
The recent drop in regional biodiversity is not so much a direct consequence of seasonal weather variability ___ systemic human disruption of local habitats.
The idiom 'not so much [A] as [B]' is a fixed comparative structure used to clarify that the second point is more accurate than the first. Option 0 ('than') incorrectly substitutes standard comparative syntax into a balanced 'as... as' structure.
Modern automated transit networks process passenger traffic far ___ than older underground systems built in the mid-twentieth century.
The gap modifies the action verb 'process', requiring a comparative adverb ('more efficiently'). Option 0 ('more efficient') is an adjective and cannot modify a verb.
The multinational accord signed last week represents the ___ ambitious international environmental initiative that the coalition has ever established.
The superlative 'most' is required because the phrase 'that the coalition has ever established' specifies an absolute ranking among all initiatives. Option 0 ('more') is incorrect because it compares only two items.
Recent statistical analyses reveal that peripheral rural communities are currently experiencing ___ higher rates of inflation than urban metropolises.
Adverbs of degree like 'substantially', 'far', or 'significantly' are used to intensify comparative adjectives like 'higher'. Option 1 ('very') cannot directly modify comparative adjectives, and option 2 ('more') creates an ungrammatical double comparative.
During the third phase of testing, the newly developed diagnostic algorithm performed ___ accurately as senior medical professionals.
An affirmative comparison of equality uses the paired structure 'as + adverb + as'. Option 0 ('so') is restricted to negative comparisons ('not so... as').
Emerging markets frequently encounter difficulty securing financing because they possess ___ capital for infrastructure projects than industrialized nations do.
'Capital' is an uncountable noun, requiring the comparative quantifier 'less'. Option 0 ('fewer') can only modify plural countable nouns, while option 3 ('lesser') refers to status or importance rather than quantity.
The second-generation solar panels are reportedly twice as ___ at converting sunlight into usable electricity as earlier models.
In multiplier comparisons ('twice as... as'), the base adjective form ('efficient') must be used between the two 'as' conjunctions. Option 1 ('more efficient') incorrectly introduces a comparative word into an 'as... as' structure.
Severe groundwater depletion remains one of the ___ threats facing sustainable agricultural output in sub-Saharan regions.
The standard construction 'one of the + superlative adjective + plural noun' requires 'greatest'. Option 0 ('greater') fails because the phrase selects from a group of three or more threats.
Agricultural land located in semi-arid zones requires significantly more irrigation water than ___ in temperate maritime climates.
In formal comparative clauses involving 'than', subject-auxiliary inversion often occurs. The singular auxiliary verb 'does' is required to match the singular noun 'land' and echo the main verb 'requires'. Option 1 ('is land') uses the wrong auxiliary verb.
The marine research team documented no ___ than fifty previously unknown species near the hydrothermal vents.
The noun 'species' is treated as plural countable here (indicated by the cardinal number 'fifty'), so 'fewer' must be used in the emphasis phrase 'no fewer than'. Option 0 ('less') is incorrect with countable nouns in formal English.
Prompt ethical regulation of synthetic biology is all the ___ imperative given the rapid pace of recent gene-editing breakthroughs.
The idiomatic structure 'all the + comparative adjective + for/because/given' means 'even more' or 'so much more' due to a specific reason. Option 0 ('most') is incorrect because this phrase strictly requires a comparative adjective.
The primary control cohort performed significantly ___ on the critical thinking assessment than expected under test conditions.
The irregular comparative adverb form of 'badly' is 'worse'. Option 0 ('badly') is the base adverb and cannot introduce a comparison with 'than'.
Hydroelectric power remains by far ___ widely utilized renewable resource in the current global energy mix.
The intensifier 'by far' modifies superlatives and requires the definite article 'the' before the superlative phrase ('the most widely utilized'). Option 1 omits the obligatory article 'the'.
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Mastering comparatives and superlatives is essential for achieving a Band 7.0 or higher in IELTS, as sophisticated comparison structures appear across all four modules of the exam. In Academic Writing Task 1, describing trends and visual data demands precise use of comparative adverbs, intensifiers, and numerical comparisons. In Writing Task 2 and Speaking, advanced structures—such as double comparatives, Latin-derived comparative adjectives, and parallel comparative phrases—allow you to evaluate complex arguments with subtlety and grammatical range.
This test targets higher-level comparative and superlative grammar beyond basic -er and -est endings. You will be tested on degree modifiers, prepositional selection with irregular comparative adjectives, ellipsis in comparative clauses, inversion patterns, and countable versus uncountable quantifiers within academic and professional contexts.
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