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A historian is giving a lecture on ancient civilizations and their trade routes. Select ALL the natural collocations that correctly complete his sentence.
"Because they lived in a desert, the empire's economy was _____ on maritime trade."
The correct answers are heavily dependent, heavily reliant, and highly dependent.
In academic English, when discussing reliance or dependence, heavily and highly are the standard adverbs used to boost the adjectives dependent and reliant.
"True" and "empty" are ungradable/absolute adjectives. We would say something is absolutely true or completely empty, never heavily true or empty.