For #2, no it doesn't sound odd, all of those combinations sound completely natural.
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January 27, 2017
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You can say, "I've failed but I've made some effort to improve."
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May 12, 2016
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Yes, they mean the same thing (or very close to the same thing).
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May 11, 2016
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I think 1 is best, 2 is ok too
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May 11, 2016
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The second sentence is ok but the first sentence doesn't make sense and is incorrect.
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May 10, 2016
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Yes, it seems to me like that is what the author is saying. Your understanding is correct.
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May 10, 2016
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Exactly, I'm afraid of heights
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May 10, 2016
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In general they mean the same thing - "not easy". However, "hard" has additional meanings. It can indicate that a material is solid or rigid. As in, "Wear a hard hat to protect your head."
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May 10, 2016
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Others are famous for being famous or for being associated with someone who is famous.
That's what this sentence is implying, but the final "famous" is omitted, but understood. Removing "who is" would slightly change the meaning of the sentence.