21. China’s economic development has made ______ rapid progress in the past 10 years, and young people have made ______ great contribution to this progress.
A. a; a B. the; / C. /; a D. /; /
22. Susan was expecting her favourite singers, but to her disappointment, _______ appeared.
A. some B. none C. everyone D. no one
23. Your essay is fairly good and yet it leaves something ______.
A. to desire B. desire C. desiring D. to be desired
24. The police have offered a large _______ for information leading to the robber’s arrest.
A. prize B. compensation C. price D. reward