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瓦尔登湖“波平如镜”，________，____________，或许，一只燕子飞掠在水面上，低得碰到了水。________，____________，____________。①或许，还会有一只鸭子在整理它自己的羽毛②其时，只有一些掠水虫，隔开了同等的距离，分散在全部的湖面③有时，全部的圆弧展露了，银色的圆弧④在远处，有一条鱼在空中画出了一个大约三四英尺的圆弧来⑤它跃起是一道闪光，降落入水，又一道闪光

I’m amazed to hear from my old friend again. _____, it is ten years since we met last.

He has _______ smoking because of his lung cancer. [ ]

n’t got the reference book yet,but I’ll have a test on the subject next month—Don’t worry You ____ have it by Friday

I usually go shopping in that supermarket, because their prices are _____.