The barber must choose between hurting an enemy or being an ethical worker
Since almost everything in the paragraph describes things that "cannot" be done or are lacking, the best descriptor of this word choice would be "barrenness." The house is empty, nothing can go into the letterbox, the doorbell won't ring. None of these things give the appearance that they could take place easily.
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D) The sentence implies that the Colonel recognizes the attendant's name.
This sentence is all about the Colonel's behavior. The Colonel does not act differently until after the attendant reveals his name. Therefore, the Colonel recognizes the attendant's name. None of the other options are correct.
However, the Colonel believes the attendant said the name Colombo, but that is not the attendant's name and the attendant sets him straight.
More info? What did Percy say about Mrs. Dodds?
