21．It is announced that_______$20,000 reward will be offered for _______ return of the stolen sculpture．
A．a; the B．/; the C．a; a D．/; a
22．--Shall I give you a ride to the Capital Airport?
--Thank you．________．
A．If you like B．It couldn’t be better
C．Of course, you can D．It’s up to you
