How do you understand the sentence “Then, and only then, are his services necessary”?
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What does the word thisrefer to in the sentence “There is a story which well illustrates this”?
Why was the medical student surprised?
Does the word illustratemean the same thing in “There is a story which well illustratesthis”and “This volume on the subject, however, happened to be so well illustrated …”?
What, according to the writer, must the owner of a bookshop do and be like?