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
