题目内容
Small farms and the lack of modern technology have ________ agricultural production.
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The Japanese scientists have found that scents ________ efficiency and reduce stress among office workers.
All the students have to ________ to the rules and regulations of the school.
He ________ his head, wondering how to solve the problem.
As soon as the boy was able to earn his own living he ________ his parents’ strict rules.
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