11.Copernicus maintained that the earth ______ round the sun.

　　A. moves

　　B. moved

　　C. moving

　　D. move

　　12.He was very ______ to go，but he had no choice.

　　A. ready

　　B. willing

　　C. reluctant

　　D. hesitant

　　13.Two-thirds of his property ______ lost in the fire.

　　A. was

　　B. were

　　C. are

　　D. have been

　　14.Remember， nothing hurts concentration ______ reading too slowly.

　　A. rather than

　　B. as well as

　　C. more than

　　D. instead of

　　15.Many people have made a ______ to a physical fitness program so as to maintain good health.

　　A. decision

　　B. commitment

　　C. contribution

　　D. difference

　　16.Scientists could see many things that most people would ______ to see.

　　A. feel

　　B. fail

　　C. fall

　　D. fill

　　17.She passed the examination ______ she studied very little.

　　A. in spite of

　　B. despite

　　C. though

　　D. in that

　　18.The father wished the twins to be doctors， but ______ of them liked to study medicine.

　　A. both

　　B. neither

　　C. either

　　D. none

　　19.John is so strongly built that he looks as if he ______ an elephant.

　　A. lifts

　　B. is lifting

　　C. lifted

　　D. could lift

　　20.The book was sold ______ 50 dollars.

　　A. in the price of

　　B. at the price of

　　C. with the price

　　D. of all the price in