Did you look up the time of trains to Shanghai?— Yes, the earliest train is ___ to leave at 5:30 am. [ ]

Everything was perfect for the picnic _____ the weather.[ ]

I was coming to your party but my car’s gone wrong.Now I can’t ________it．

把下列带序号的句子组合成语意连贯的一段话，最恰当的一组是①理想从来没有高纯度的范本②它的出现，是心智对物界和实证的超越③它只是一种完美的假定④是数学之镜中一次美丽的日出⑤有点像数学中的虚数⑥这个数没有实际的外物可以对应，但它常常成为运算长链中不可或缺的重要支撑和重要引导

Most people advisethat students’ heavy burden __________.