21. ---Excuse me, would you please give_________ magazine to Mary?
--- Sorry, but I don’t think there is_________ Mary in my class.
A. a; / B. the; / C. a; a D. the; a
22. The money collected should be made good use ______ the people who suffered a lot in the earthquake.
A. of helping B. to helping C. to help D. of to help
23. —Why on earth didn’t you answer the phone?
—I’m terribly sorry, but the doorbell ______, too.
A. is ringing B. rang C. was ringing D. was about to ring
