21. ––– Could I use your phone for a moment?
––– ______. Help yourself.
A. Take your time B. Forget it C. By all means D. Never mind
22. --Tony, come down and help me with the heavy box!
-- Come on! I _____ all day long．Get Peter to do that!
A．work B．had been working C．had worked D．have been working
23. In our school students are _____ according to how much they know and how old they are. A．classified B．combined C．condemned D．betrayed
24. ---Why didn’t you buy the gold ring?
--- I ______ but I didn’t have the money.
A. would have B. bought C. would like to D. had bought
