根据对话内容，从对话后的选项中选出能填人空白处的最佳选项，并在答题卡上将该项涂黑．选项中有两项为多余选项．
Mary：Hello． This is Mary． （51）     
Mike：Oh，Mary． This is Amy． （52）    I've got hold of you at last．
Mary：Nice to hear from you again after all these years'． What have you been doing？
Mike：Well，I've tried many things since school． I'm now working for a food processing company in charge of sales． So I travel a lot．
Mary：（53）      You must really enjoy it．
Mike：Oh，I do． Yeah，it's interesting，but it's quite tiring．  （54）    
Mary：I work in a law firm，practicing in business law．
Mike：（55）    
Mary：Yeah，but I like my job．

A．My goodness!
B．What a shame!
C．Oh，that's great!
D．Who is it，please？
E．How can I help you？
F．Oh，that's challenging．
G．What about you，Mary？

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