Final answer:
The word 'stupor' completes the sentence describing the class's reaction to the question about space travel events with a sense of mental numbness or daze.
Explanation:
Commiseration means feeling of pity or sorrow for someone's suffering. In the sentence provided, the word that best completes it is stupor. Stupor refers to a state of mental numbness or daze, which fits the context when the class sat in a state of bewilderment or confusion upon being asked about space travel events.
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