20．What a pity. If I had caught that flight, I 　　　　over the Pacific Ocean now.

　　　 A．would fly　　　　　　　 B．would have flown　　 C．would be flying　　　 D．were flying

19．I don’t think it easy, even if we work hard, 　　　　　the South Korea and the North Korea to sit down to talk at present.

　　　 A．persuaded　　　　　　　 B．to persuade　　　　　　 C．persuade　　　　　　　　 D．persuading

18．He is considered to be a gifted manager, 　　　　with a quick mind and good humor.

　　　 A．one　　　　　　　　　　　　 B．each　　　　　　　　　　　 C．that　　　　　　　　　　　　 D．who

17．　　　 what I had previously thought, my new deskmate turned out to be a very interesting guy.

　　　 A．Instead of　　　　　　　 B．In spite of　　　　　　　 C．Contrary to　　　　　　 D．Because of