The starsThere are millions of stars in the sky.If you look

The stars
There are millions of stars in the sky.If you look (6) ______the sky on a clear night,it is possible to see about 3000 stars.They look small,but they are really (7) ______ big hot balls of burning gas.Some of them are huge,but others are much smaller,like our planet Earth.The biggest stars are very bright,but they only live for a short time.Every day new stars (8) ______ born and old stars die.All the stars are very far away.The light from the nearest star takes more (9) ______ four years to reach Earth.Hundreds of years ago,people (10) ______ stars,like the North star,to know which direction to travel in.Today you can still see that star.
6.A at B up C on
7.A very B too C much
8.A is B be C are
9.A that B of C than
10.A use B used C using