People are beginning to realize that to ______nature at will is the biggest mistake that man has ever made.
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Some of your suggestions have been ______, but others have been turned down as they are not workable.
All of a sudden, he lost his interest in engineering, and______his attention on learning a foreign language.
If a company decreases health benefits for its employees, they should increase salaries to_______the workers.
I failed to pass the exam although I had worked very hard. I should ______the causes of my failure.