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For 'I can honestly say I did my best.': * [说实话]我已经尽力了 or * 我[真的]已经尽力了 ←probably the most colloquial one *
目前=in current condition 现在=now they've just got some slight difference, in most of the time they are interchangeable.
其他人 is used more often than 别的人 in everyday life, although they have the same meaning. Also in my opinion, 别人 sounds more appropriate than 别的人.