How to practice: This set collects only the Complete the Sentence 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
Many companies are redesigning their supply chains to minimize waste and operate in a more _____ manner.
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Correct: sustainable
Q2 · Fill in the Blank
Adopting energy-efficient appliances at home is a practical step individuals can take to _____ their environmental footprint.
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Correct: reduce
Q3 · Fill in the Blank
The rapid _____ of electric vehicles is being driven by both government incentives and falling battery costs.
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Correct: adoption
Q4 · Fill in the Blank
Urban planners are increasingly incorporating green spaces into city designs to _____ the effects of the urban heat island phenomenon.
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Correct: mitigate
Q5 · Fill in the Blank
Scientists have identified methane as a particularly _____ greenhouse gas because it traps far more heat than carbon dioxide over a shorter time horizon.
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Correct: potent
Q6 · Fill in the Blank
Corporate sustainability reports are now scrutinized by investors who want to assess whether environmental commitments are _____ or merely performative.
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Correct: genuine
More complete the sentence sets at other levels · Browse the full DET question bank