14. What _______ pity that you couldn’t be there to receive ______ prize!

　　A. a; a

　　B. the; a

　　C. a; the

　　D. the; the

　　15. Some people fear that _______ air pollution may bring about changes in _______ weather around the world.

　　A. /; the

　　B. the; /

　　C. an; the

　　D. the; a

　　16. In order to find ______ better job, he decided to study _______ second foreign languages.

　　A. the; a

　　B. a; a

　　C. the; the

　　D. a; the

　　17. The biggest whale is ______ blue whale, which grows to be about 29 meters long—the height of _____ 9-story building.

　　A. the; the

　　B. a; a

　　C. a; the

　　D. the; a

　　18. We can never expect _____ bluer sky unless we create ______ less polluted world.

　　A. a; a

　　B. a; the

　　C. the; a

　　D. the; the

　　19. My neighbor asked me to go for ______ walk, but I don’t think I’ve got ______ energy.

　　A. a;不填

　　B. the; the

　　C.不填; the

　　D. a; the

　　20. It’s _______ great fun to have ______ e-friend from an English-speaking country to help me with my English study.

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