二、单项选择（共15题,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. We discussed where to go for a whole morning, but we decided to stay at home_____.
A. at the end B. by the end C. in the end D. on end
23. _____ of the students who took part in the military training is 450.
A. A number B. A lot C. Lots D. The number
