Air bags for cars were invented _____ lives. Without them more people would be injured in car accidents.
Scientists are hoping for a _____ in the search for a cure for cancer.
____ news came _____ an unknown disease was spreading in the area.
They have no idea at all ______.
Even though the Smiths have moved to a faraway place, we still see them ___.
He was ______ to find that it was almost impossible to undertake the task.