We have just climbed out of a spaceship onto the _____ of the moon. Behind us is the ship, half in the sunlight and half in deep _____. A few miles ahead is a wall of mountains towering against the black sky. And there, as though resting on the mountains, is a great ball of light, beautifully _____ in blue and green and brown with a patch of dazzling white at the top. It is our own faraway world ---the earth.We take a step and rise like prize _____ up, float, and down again. Hopping carefully, we explore the valleys, the sloping crater walls, the shadowy crater floors. Not a sound can be heard---there is no air to carry sound, no wind; there are no smells, no plants, no animals. There is nothing but rock and dust, _____sunlight and cold black shadows.