题目内容
It is generally _____ that society is a jungle where only the fittest survive.
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It has been proved that _____ exercise may also cause health problems to both young and old.
Companies are now trying to _____ their waste or find other ways of disposing of their by-products.
Tests of chemical have shown that the air after the explosion has a high level of _____ waste.
The Prime Minister said it was _____ that the release of all hostages be secured.
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