II 选择最佳答案填空。（共15小题，每小题1分，满分15分。）
21. Mr. Huang will ________ in the movement.
A. play a leading part B. take parts C. play leading part D. take a part
22. At the beginning, he started his business on a shoestring(零星资金)and build it up _________.
A. gradually B. slowly C. probably D. presently
