the highest state of love is reached once you get throuh those insipid days.这句里的 reached once 为什么这么用

题目

the highest state of love is reached once you get throuh those insipid days.这句里的 reached once 为什么这么用,请分析一下,
sometimes,the simplest advice that you give to others is the hardest thing for you to follow.这里的to follow为什么用在这里.
instead of complaining that the rosebush is full of thorns,be happy that the thorn bush has rose这句里的that不用可以吗,

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