We know much about the universe(宇宙). It means the earth, the sun, the moon, the stars, and the space 21them.
Most of the stars are much bigger than the moon, but they look smaller 22they are far away from the earth. At night, the moon is high in the sky like a light. But the moon has no light of its own. The light of the moon（3）the
sun. The sun gives us light, heat and life. And the plants, animals and men will die without the sun.
The earth is going around itself （4）. When the part of the earth turns to the sun, it is day. The （5） part of the earth is night.
The earth is our homeland. We should love it.
2、______

A.because

B.comes from

C.between

D.dopposite

E.eall the time