单项选择题
He saved the drowning child（）the cost of his own life.
A．on B．at C．for D．with
单项选择题 Scarcely（）asleep when a knock at the door awakened me.
单项选择题 Lincon looked as though he（）ill for a long time.
单项选择题 （）a reply, he decided to write again.
