题目内容
With a new technique ______ out, the yields as a whole increased by 27%.
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If _____ for an explanation of the population explosion in the world, I would definitely find it difficult.
Three robbers rushed into the bank with their faces _____ by black stockings.
Do you know __________ the pie out of the oven?
The students expected there _________ more review classes before the final exams.
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