英语习题，大侠进

1. _______ is the center of our planetary system was a difficult concept to grasp in the Middle Age.
A) It is the sun and not the earth
B) Being the sun and not the earth
C) The sun and not the earth
D) That the sun and not the earth
2. _______ it or not, his discovery has created a stir in scientific circles.
A) Believe
B) To believe
C) Believing
D) Believed
3. _______ kinds of matter in the world.
A) There is a few million
B) That there are millions
C) There are a few million
D) It is millions
4. _______ man can now create radioactive elements, there is nothing he can do to reduce their radioactivity.
A) As
B) Whether
C) While
D) Now that
5. _______ me, I think an English-Chinese dictionary is much more helpful to our study than an All-English dictionary.
A) As far as
B) As far
C) As for
D) As regard
6. _______ my return, I

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