Final answer:
The correct adverb in the given options is 'never.'
Step-by-step explanation:
The correct adverb in each sentence should be never. In the first sentence, it should be 'I've never' instead of 'I've ever.' In the second sentence, it should be 'I've never' instead of 'I've ever.' In the fourth sentence, it should be 'I've never' instead of 'I've ever.' Finally, in the fifth sentence, it should be 'I have never' instead of 'I have ever.'
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