提示: Mary在一家电器店买了一台录音机，回去后发现机器不转，便拿来要求退货。店员请她指出问题，并表示愿意为她修理。经检查发现是电源未接通。
(S= shop assistant M= Mary)
S: Morning.___ 51___miss？
M: Uh，I&39;d like 10 return this tape recorder and get my money back.S:___ 52____ ？
M: It doesn&39;t work.
S:I&39;m very sorry, but___53___
M:I got this recorder only yesterday. Are you sure it won&39;t go wrong again？
S: The service department in our store is quite good at that sort of thing. ___ 54___
what the troubles is？
M; It simply doesn&39;t work. You see, none of the buttons work. Try it yourself.
S:OK, Let me see. Oh, ___55___ miss. Now it works very well.