_____ is hard is to do good all one's life and never do anything bad.
_____ is no doubt _____ John’s knowledge of first aid saved Ms Slade’s life.
In ____ accident _____ knowledge of first aid can make _____ real difference.
—“Did you have any difficulty in yesterday’s homework?”— “No, in fact I found _____.”
she is not so cheerful she used to be?
—Will you go to see the movie A Simple Noodle Story tomorrow evening? — No, I am going to a lecture, or at least I am planning _____.