题目内容
After a short holiday, he _____________ himself once more to his studies.
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The two brothers are very much _______, not only in appearance but also in thinking.
They have ______ for the car to pick them up at the station.
As a defense against air-pollution damage, many plants and animals _____________ a substance to absorb harmful chemicals.
Frequently single-parent children ________ some of the housework.
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