第二部分： 单项选择 （共15小题；每小题1分，满分15 分）
21. Eric fell ill suddenly but was so foolish. He didn't even have ________ common sense to send for ______ doctor.
A. the; the B. a; the C. the; a D. a; a
22.________ some of the orange juice and perhaps you will like it.
A. Trying B. Try C. To try D. Have tried
