题目内容
As a defense against air-pollution damage, many plants and animals _____________ a substance to absorb harmful chemicals.
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Frequently single-parent children ________ some of the housework.
By the fact that he stayed in the United States for more than ten years, he developed an American ________.
If you want to ______ a pleasant visit, find out as much as possible about the manners and customs of your host country.
I like my teacher, but feel no ________ for her.
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