How to practice: This set collects only the Fill in the Blank question type from the real DET (Duolingo English Test) — DET Reading & Vocabulary questions. No grading, no timer — solve it yourself, then tap each question to reveal the answer or model response.
Q1 · Fill in the Blank
Governments around the world are under increasing pressure to _____ carbon emissions before the end of the decade.
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Correct: reduce
Q2 · Fill in the Blank
Solar and wind power are considered _____ sources of energy because they naturally replenish themselves.
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Correct: renewable
Q3 · Fill in the Blank
The transition to a green economy will require substantial _____ in infrastructure and technology.
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Correct: investment
Q4 · Fill in the Blank
Scientists warn that rising sea levels could _____ coastal communities within the next fifty years.
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Correct: displace
Q5 · Fill in the Blank
Many corporations have pledged to become carbon _____ by adopting cleaner production methods.
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Correct: neutral
Q6 · Fill in the Blank
Conservationists argue that protecting _____ is essential to maintaining the balance of natural ecosystems.
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Correct: biodiversity
More fill in the blank sets at other levels · Browse the full DET question bank