题目内容
My roommate is always very optimistic, and that’s why he still _____ his good humor after all the setbacks.
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There is a widely held suspicion that the politician, though retired, still has great power and is _______ events behind the scenes.
The organization has been working with local authorities as well as regional government and officials to ________ the problem of climate change.
People who work in offices are ______ as “white-collar workers” for the simple reason that they traditionally wear a white shirt with a collar and a tie to go to work.
When the police arrived, he had already destroyed the evidence that was ________ his earlier statement made a few hours ago.
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