We can't understand ______ a decision until it is too late.
—Will you stay for lunch? —Sorry, _______.My brother is coming to see me.
Johnny, you _______play with the knife, you _______hurt yourself.
I should have been there, but I _______ not find the time.
—Are you coming to Jeff's party? —I'm not sure. I _______ go to the concert instead.
Mr. Bush is on time for everything. How _______ it be that he was late for the opening ceremony?