........! What a fuss he's making!
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Hardly
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Highly
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Gradually
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Honestly
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Heartily
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Correct answer
Explanation
'Honestly!' is correct as an exclamation expressing exasperation or disbelief. Here it's a reaction to someone making an unnecessary fuss, similar to saying 'Honestly!' or 'Really!' when annoyed. The other options don't work as emotional exclamations.