Ittook _____building supplies to construct these energy-saving housesIt took brains, too.[ ]

Where is Tom this morning— He’s got a cold— ____

They _________ on the program for almost one week before I joined them, and now we are still working on it as no good results have come out so far

依次填入下面一段文字横线处的语句，衔接最恰当的一组是（ ）现在小结如下：科学家相信宇宙受定义很好的定律制约，这些定律在原则上允许人们去预言未来。 这要按照宇宙的现有密度而定。①所以，人们可以预言，宇宙将永远膨胀下去呢，还是最终将会坍缩。②这样，人们在实际上经常只能对未来相当短的时间作准确的预言。③这意味着初始状态的微小变化会导致后续行为的快速增大的改变。④然而，宇宙大尺度的行为似乎是简单的，而不是混沌的。⑤但是定律给出的运动通常是混沌的。

She often helps ______ do homework.