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 - The passage mentions that Mr. Hooper has something on his face that causes surprise, but does not explain what that is.
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why people are so surprised by Mr. Hooper’s appearance - While it is clear that the villagers are astonished, the reasons for their surprise are not specified in the passage.
These choices highlight the uncertainties surrounding Mr. Hooper's appearance and the villagers' reactions.