题目内容
Yet, as earth's other natural resources _____, nations eye the Antarctic as a final repository.
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Some are in favor of the ____ system.They hold that since students attend the teachers' classes every day, they should have their opinions about their teachers' effectiveness.
He vowed to achieve certain ____ before the end of his presidency.
The on-site system has a _____ advantage in this respect, in that no transport problem exists..
In the inflationary blowup of the late 1970s, diamonds were the subject of_____ investment fervor.
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