If these measures can’t help ______such a tragedy from happening again, what’s the sense of taking them?
He’s unlucky, and he’s always suffering _____ luck one after another.
______ part that women _______ in society is great.
You are really very kind. I’ll never forget the____you have done to me.
A computer is so useful a machine ________ we can use everywhere.
— Why didn’t you come to Mike’s birthday party yesterday? — Well, I ____, but I forgot it.