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