21．If I drive in this city myself, I’ll probably get lost as I haven’t got        very good sense of       direction．

A．a; 不填   B．the; 不填   

C．a; the    D．the; a

22．—Which share is meant for me?

—You can take       half．They are exactly the same．

A．this    B．any    

C．each    D．neither

23．—How about the two of us chatting online?

—        ．It’s much cheaper than talking on the phone．

A．No way   B．Why not?   

C．All right   D．No matter