题目内容
The new system designed to ________ harmful emissions (排放物) from factories will be put into use soon.
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To make our companies ________ in the market, we have to be more creative and productive.
People are beginning to realize that to ______ nature at will is the biggest mistake that man has ever made.
It is difficult to conclude what a() ______ student does in his spare time because every student has different interests.
A month ago I wrote to the store complaining about its bad service, but I haven't gotten a() __________ yet.
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