题目内容

__________ (n)an answer to a problem

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__________ (v) to write or speak formally about something

__________ (v)to move in the air or on top of a liquid, such as water

__________ (v) to remove dirty or unwanted things completely

B.Choosethebest word or phrase to complete eachsentence.I am aware it is a big problem, but if we all work together, I'm sure we can think of a good____________.