21. -------may i borrow your paper?
------ ______.
a. by all means b. never mind c. you are welcome d. don’t mention it
22. most of ______ we call geniuses are successful only because they have made extraordinary efforts.
a. which b. that c. whom d. what
23．according to an old proverb，a red sky at night often fine weather the next day．
a．indicates b．impresses c．obtains d．occurs
24. ______for the timely investment from the public, our company would not be so booming now.
a. had it not been b. were it not c. if it was not d. be it not
25. ------you are lucky that she is very thoughtful and devoted to you.
------ in fact, i don’t want to ____ her with my problems all the time.
a. hire b. strike c. bear d. bother
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