After _________ seemed like hours, a nurse wheeled Doris out of the emergency room.

It was ten years _______ he returned to his hometown and set out to revenge his dead father.

A man does not know the difficulty of anything _____ he does it personally . 

_____difficulty we will face, we should have confidence and try to solve it.

I think Tom, as the head of a big department, should either study regularly or______    his job.