20．--- Sir, I have a favor to ask you.　

　　　 ---___________.

　　　 A．It’s a pleasure 　　 B．Go ahead　　 　 C．What, please　 　　 D．Help yourself

19．______ is no possibility _____ the shy girl can win the first prize in the English speech contest.

　 　　 A．There; that　　 　 B．It; that　　 　　　　　 C．There; whether 　 D．It; whether

18．--- This is my treat and next is yours. How’s that?

　　 ---- OK. _______.

　 　　 A．It doesn’t matter　 B．It depends　 　　　 C．No way　　 　　　 D．It’s a deal