句子翻译 (共5小题；每小题3分，满分15分)
小题1:我们都知道2月是一年中最短的月份。
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小题2:当我们到的时候，医生正在给他的腿动手术。
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小题3:下了如此大的雪以至于地面被雪覆盖了。
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小题4:她已经厌倦了什么？
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小题5:把孩子独自留在家里是很危险的。
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小题1:We all hnow that February is the shortest month of the year.
小题2:When we arrived , the doctor was operating on his leg.
小题3:It snowed so hard that the ground was covered with snow.
小题4:What has she bored with /been tired of ?
小题5:It is very dangerous to leave children alone at home
题目分析：
小题1:根据句意，应该应用最高级，注意形容词最高级前加the,故填We all hnow that February is the shortest month of the year.
小题2:when 引导的从句表示一个时间点，强调在这个时间点上另一个动作正在发生，故填When we arrived , the doctor was operating on his leg.
小题3:so .. that 如此……以至于……，根据提示，故填It snowed so hard that the ground was covered with snow.
小题4:be tired of …厌倦了……，故填What has she bored with /been tired of ?
小题5:it代替动词不定式做形式主语，It is +形容词 +（ of/for sb.） +to do sth.故填It is very dangerous to leave children alone at home