依次填入下列横线处的词语，最恰当的一组是（ ）办公人员的座椅高度是非常有讲究的。专家___ ，许多人办公座椅的高度都存在一定问题，久坐会__ 疲劳感，并出现腰酸背痛的毛病。正确的做法是：首先根据工作性质把办公桌调整到一个__ 的高度，然后再依据自身情况来调整座椅的高度。

The child ________when his father told him a funny story.[ ]

The victims of the earthquake are in need of help. We should do something for them immediately.

Mr. White, will you please teach me how to perform pair skating today?– . You have to practise single skating well first.

nt to the box office at lunch time, but all the tickets ____out