No one can be sure _______ in a million years.
He had his camera ready ____he saw something that would make a good picture.
Look over there--- there’s a very long,winding path _____up to the house.
I'm afraid he’s more of a talker than a doer, which is ____ he never finishes anything.
They are broadening the bridge to ____ the flow of traffic.
The two girls are so alike that strangers find ___ difficult to tell one from the other.