补全对话（根据对话内容，从对话的选项中选出能填入空白处的最佳选项，将其字母序号写在答题卡上。选项中有两项为多余项。每小题2 分；满分10分）
—He is very good , isn’t he ?
—16__________
—I said the singer was great .
—17__________
—Have you seen him here before?
—18_______I think he probably writes the music and words because I’ve never heard any of the songs before .
— It’s not fair.
—19_________
—People with musical ability like that have to stand around here to make a living .
—Perhaps he enjoys it or makes more money than you think.
—20___________
A．What do you mean ?
B．Sorry , what did you say ?
C．I hope so .
D．Do you like popular music ?E. Be quiet , listen to him .
F. Yes , and interesting to watch
G. Oh , yes . He’s always at exactly the same place on Saturdays when I come into town
