Last week a tennis ball hit me on the head, but I tried to _______ the pain, believing that it would go away sooner or later.

My father asked me ________ with me.

_ is known to us all that the old scientist, for _______ life was hard in the past, still works hard in his eighties.

下列各句中，加点的成语使用恰当的一项是（ ）

He made a serious mistake，but he took action to change that it got worse.