II. Choose the correct word A, B, C or D for each gap to complete the following passage :
What is the sky? Where is it? How high is it? They aren’t easy to (1)_________, are they? Is the sky blue? The sky has no color. Is the sky full of air? We know that there is air around the (2)__________. When planes fly, they need air. Planes can’t fly very quickly because when they go higher the air gets (3)__________. If we go far away from the Earth, we (4)__________ there is no air.
Maybe we can answer some of our questions now. What’s the sky? (5)__________, whereis it? It’s all around the world. They sky is a space. In this space, there is nothing besides the Sun, the Moon and all the stars.
1. A. answer B. ask C. think D. know
2. A. sun B. moon C. earth D. star
3. A. bigger B. heavier C. thinner D. smaller
4. A. know B. feel C. smell D. touch
5. A. But B. Even C. Or D. And
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