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We must live every day like the last day, because we don't know what surprises life has in store.  Appreciate your closers ???, be kind to other people, respect your relatives. Be happy)) HaVE a GoOd DAy!))

* There's only one last day :)

* "surprises [life/my boss/god/etc...] has in store" is a common phrase.  Though "prepares for us" isn't wrong, it's less natural.

* "closers" is not a word - I'm not sure which noun you meant - relatives, friends, peers?

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We must live every day like [the - this is an expression] last [it is already clear what you're talking about], because we don't know what surprises life [has in store - again this is an expression] for us. Appreciate your [closest], be kind to other people, respect your relatives. Be happy)) HaVE a GoOd DAy!))