A. on duty B. on time C. on the sport D. on watch
单项选择题Whose secretary is calling（）
A. Mr. Tom’s. B. To confirm her boss’s appointment. C. Mr. Smith’s. D. Today at two o’clock.
单项选择题Think it over a few days. You don’t have to make（）your mind right now.
A. out B. for C. up D. on
