题目内容
My father's life work was devoted to the __________ of the wilderness.
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No one will ever know what mix of talent, __________ energy and luck made Dickens such a singular writer.
One-room schoolhouse can still be found in __________ areas where there are no other schools for many miles.
Parents are __________ by law to send their children to school.
Researchers documented claims of environmental friendliness made by about 2, 000 products and found many too __________ or too misleading to meet ISO standards.
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