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来源：www.examda.com

　　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

　　8. Nowhere but in the remotest region of the country     find a place to settle down.

　　A. can he B. he can C. he D. for him to

　　9. With one leg broken in that car accident， he cannot even walk，      run.

　　A. let alone B. that's to say C. not to speak D. not to mention

　　10.     ， she led a life of complete seclusion.

　　A. Being disgraced B. Disgraced C. Disgracing D. She was disgraced

　　11. It     to see so many children in that mountainous area cannot even afford elementary education.

　　A. pains her B. makes her pain C. is paining D. is pained

　　12. Our boss， Mr. Thompson，     a raise in salary for ages， but nothing has happened yet.

　　A. was promising B. has been promising

　　C. promised D. has promised

　　13. A dream is to a person is     wings are to a bird.

　　A. that B. which C. what D. as

　　14. The man sitting opposite me smiled dreamily， as if     something pleasant in the past.

　　A. to remember B. remembered

　　C. having been remembered D. remembering

　　15. I     him the Christmas gift by mail because he came home during the Christmas holidays.

　　A. ought to have sent B. couldn't have sent

　　C. must have sent D. needn't have sent

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