1 . As is known to all, the ________ (nature) resources are limited. (所给词的适当形式填空)
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2 . It is hoped that ________ (nature) resources will be found on Mars. (所给词的适当形式填空)
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3 . This proverb is saying we have to let things go in their ________ (nature) course. (所给词的适当形式填空)
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4 . Honest is a ________ (nature) quality (品质). (所给词的适当形式填空)
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