Classification is a useful ______ to the organization of knowledge in any field.
There’s little doubt _____ we will _____ the game.
On stepping into his room he was astonished to find the floor covered with _____looked like tiny insects.
People traveling long distances frequently have to decide ______they would prefer to go by land, sea or air.
After five years of preparation, Shanghai presented the world____many said was the greatest Special Olympics.
We haven’t settled the problem of_______it is necessary for him to study abroad.