12. A larger brain makes man ____ to animals. A. better B. superior C. excelled D. outstanding

　　13. He was always finding ____ with his daughter’s friends. A. blame B. error C. mistake D. fault

　　14. It was too late to ____ of the contract. A. back out B. back down C. back up D. back away

　　15. She had just ____ the shell of the hard-boiled egg and was starting to peel it off. A. snapped B. cracked C. fractured D. burst

　　16. Children who are praised for their work are always ____ on. A. encouraged B. approved C. inspired D. spurred

　　17. It is impossible for parents to ____ their children from every danger. A. protect B. relieve C. preserve D. conserve

　　18. Even though the main source of ____ exposure for a majority of the human population is the sun, the artificial tanning from sun beds contributes significantly to the total UV risk. A. extra violent B. extra violet C. ultraviolet D. ultravirus

　　19. This is ____ work. It calls for a good eye and a steady hand. A. precise B. precision C. exact D. exactness

　　20. I wouldn’t trust such a ____ person. A. deceitful B. deceptive C. decisive D. deceive