21.---the floor is dirty. can anyone clean it?
---______i do it all the time.
a.don’t mention it. b.why you? c.not sure. d.not me again.
22.mr black, who is a ______, is in love with miss smith, who is a ______.
a.cooker,typewriter b.cook,typist c.cooker,typist d.cook,typewriter
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