The two correct answers that explain what is left uncertain in the passage are:
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what Mr. Hooper has on his face - This is directly referenced in the passage when the sexton expresses astonishment about Mr. Hooper's appearance, implying something unusual or noteworthy is on his face, but it is not explained.
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why people are so surprised by Mr. Hooper’s appearance - The reaction of the villagers indicates that Mr. Hooper's appearance is unexpected or shocking, but the passage does not clarify why they feel this way.