完形填空
The world is full of variety.Trees,grasses and other （2） cover the earth.Above the sun shines on the earth as it turns in the universe.This is the world that we see （4） us every day.
This world is also the world of chemistry.In this world one from of matter is （6） changing into another.We cannot always see it （7） with our eyes.Yet it is taking （8） all the same.The millions of forms on the earth,living or not,are （9） about one hundred chemical elements.The same elemants are found everywhere.This way be a surprise to you,but it is true （10） of the earth （10） of the whole universe.
（）2.-A.planets B.planes C.plants D.put
（）4.-A.above B.under C.round D.about
（）6.-A.sometimes B.never C.anytime D.always
（）7.-A.happen B.to happen C.happening D.happened
（）8.-A.play B.place C.space D.room
（）9.-A.made with B.made by C.made in D.made of
（）10.A.not only...but also B.either...or C.neither...nor D.so...that