Is ___ possible to fly to the moon in a spaceship?
The time he has devoted in the past ten years_________the disabled is now considered__________ of great value.
His silence at the meeting suggested that he _________ to your plan.
The Committee had met many times, but had not come up with __________ to the problem.
—I don’t think you can manage it. —That __________!
Two hundred miles ______ a long distance ______ in two hours even by a fast car.