1.Finding themselves safely at home, it would be of no importance whether they had ever been away.

be of no importance=be+形容词=be important

2.From so horrible a beginning, what might come next. How far would the bloody work go.

so horrible a beginning,非常可怕的开始，相当于such a horrible beginning

3.That is the time of year when lilac plants burst into flower throughout much of the United States.

burst into闯入,开出,突然出现

例句：The audience burst into simultaneous applause.
      观众齐声叫好。

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