£¨   £©21. Mr. Green is rich. He ______ his dog ______ meat.

 A. feeds, to        B. feeds, on    C. gives, to 

£¨   £©22.Don’t keep others___ for a long time. It’s impolite.

A. waiting          B. wait              C. to wait

£¨   £©23.Tony hardly said anything at the meeting ,  ___he?

A. didn’t          B. does             C. did

£¨   £©24. --- Have you finished your composition _______? 

---Yes, I’ve done that ________.

A. ever, never      B. before, just    C. yet, already