第二部分：单项选择（共15小题；每小题1分；满分15分）。
21. They discussed the problem for a whole day, but they couldn’t come to a(an) __________.
A. end B. conclusion C. reaction D. lecture
22. －May I have a talk with the manage r?
--Sorry, he ____ with his guests.
A. is talking B. talking C. talks D. talked
