You look a bit worried .—-It’s raining , but I ________my umbrella at home .

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（ ）肺上有蛋白沉积可以洗，尘肺、矽肺也可以洗，那么，吸烟熏黑的肺能不能洗干净呢我们在戒烟宣传册中常常看到黑黑的肺，_______________。煤焦油的特点是微溶于水，溶于苯、乙醇、乙醚、氯仿、丙酮等有机溶剂，但临床上不可能用有机溶剂来灌洗肺。所以，从目前来看，被烟熏黑的肺无法灌洗干净。

People all over the world are kept _______ of what is happening at once by means of the Internet.

The nurse allowed the visitors to remain the visiting hours，though it was not permitted

He was a good student and scored _____ average in most subjects.[ ]