21. ---What do you think of modern art?
   ---______, it’s awful.
   A. I like it very much      B. I can’t agree more   C. I don’t think so        D. I can’t stand it
22. Now ______ good many old people are also fond of playing games on ______ internet.
A. the; 不填      B. a; the       C. the; the       D. a; 不填
23. To our surprise, Tom has ______ George as captain of our football team.
   A. replaced    B. placed    C. covered   D. reduced