二．单项选择（共15小题，每小题1分，满分15分）
21. Mary heard ____strange sound at ____midnight outside his house and got scared.
A. a; / B. the; / C. /; the D. /; a
22. According to today’s newspaper, the escaped prisoner threatened to _____ the police station in the near future.
A. use up B. show up C. blow up D. call up
23. . —How long ________ at this job?
—Since 1990.
A. had you been employed B. have you been employed
C. were you employed D. will you be employed
24. China is one of the developing countries ________ the third world.
A. belongs to B. belonging to C. is belonging to D. belonged to
25. She bought the same skirt at a lower price at the same shop where I bought mine because she was a __________ customer.
A. common B. usual C. normal D. regula
26. Tony was _________ to five years in prison for abusing his power during his service in the local government.
