We know much about the universe. It means the earth, the sun, the moon and the stars,

and the space __21__ them.

Most of the stars are much bigger than the moon, but they look smaller __22__ they 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 __23__ 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 round itself __24__. When the part of the earth turns to the sun, it is day. The __25__ part of the earth is night.

The earth is our homeland. We should love it.

21)、

A.because

B.comes from

C.between

D.opposite

E.all the time

22)、

A.because

B.comes from

C.between

D.opposite

E.all the time

23)、

A.because

B.comes from

C.between

D.opposite

E.all the time

24)、

A.because

B.comes from

C.between

D.opposite

E.all the time

25)、

A.because

B.comes from

C.between

D.opposite

E.all the time