Columbus was considered___the great land of America
. ---Who will address the students from our school this evening? --- ______ to be the speaker.
Tommy had had a three-mile drive north _____ he could turn and head back south.
The scientists all agreed that rules of physics, ______ we are all familiar, govern the world.
The news _____the president was killed soon spread over the country.
The article is too long. It needs _______ a little.