其结构简单，采用耐高温的密封保护管，内装熔丝或熔片的熔断器是()。A.封闭式熔断器

根据对话情景和内容，从对话后所给的选项中选出能填入每一空白处的最佳选项。选项有两个为多余选项。（此题请答在答题纸上）
—He is very good, isn’t he?
—    6    
—I said the singer was great.
—    7  
—Have you seen him here before?
—    8   I think he probably writes the music and words because I’ve never heard any of the songs before.
—It’s not fair.
—    9     
—People with musical ability like that having to stand here to make a living.
—    10    

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.