Problem: Jane knocked on the door, and Susan answered it. *She* invited her to come in.
Are "She" and "Susan" the same?
****
Answer: yes

Problem: Sam Goodman 's biography of the Spartan general Xenophanes conveys a vivid sense of the difficulties *he* faced in his research.
Are "he" and "Xenophanes" the same?
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Answer: no

Problem: I stuck a pin through a carrot. When I pulled the pin out, *it* had a hole.
Are "it" and "the pin" the same?
****
Answer:
no