The prisoner was ________ of his civil liberty for three years.
A discharged
B derived
C deprived
D dispatched
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Small farms and the lack of modern technology have ________ agricultural production.
A blundered
B tangled
C bewildered
D hampered
The Japanese scientists have found that scents ________ efficiency and reduce stress among office workers.
A enhance
B amplify
C foster
D magnify
All the students have to ________ to the rules and regulations of the school.
A confirm
B confront
C confine
D conform
He ________ his head, wondering how to solve the problem.
A scrapped
B screwed
C scraped
D scratched