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1. Nowhere in nature is aluminum found free， owing to its always with other elements， most commonly with oxygen.
A. being combined B. having combined
C. to combine D. combined
2. Physics is the present day equivalent of used to be called natural philosophy， from most of present-day science arose.
A. which， what B. that， which C. what， which D. what， that
3. On no account ever leave the baby at home alone.
A. should you B. you should C. shall you D. you shall
4. the center of our planetary system was considered as heresy by the church in the Middle Ages.
A. It is the sun and not the earth is
B. That the sun and not the earth is
C. Being the sun and not the earth is
D. The sun and not the earth is
5. The reason that his property was confiscated by the country， it ， was that he was involve in a lot of fraudulent activities during the war.
A. was turned out B. was being turned out C. being turned out D. turned out
6. I'd rather you by train because the weather forecast said there would be heavy snow， tomorrow.
A. went B. should go C. will go D. go
7. Einstein won the Nobel Prize in 1921 and enjoyed great fame in Germany until the rise of Nazism he was expelled from Germany because he was a Jew.
A. when B. who C. then D. which