21．—Would you mind giving your advice on how to improve our business management?
—If you make ______ most of the equipment, there will be ______ rise in production．
A．不填；不填 B．the；a C．不填；a D．the；不填
22．When I was at college I ______ three foreign languages, but I ______ all except a few words of each．
A．spoke; had forgotten B．spoke; have forgotten
C．had spoken; had forgotten D．had spoken; have forgotten
