30. The bad weather _______ our school sports meeting by a week.

　 A. set back　　　　 B. set down 　　　C. set off　　　 D. set aside

29. The USA makes a lot of excuses in an attempt to make war on Iran , however, its ______ purpose lies in the abundant oil there.

　 A. logical　　　　 B. fundamental　　 C. accurate　　 D. common

28. Once you have experienced the _____ of bungee jumping, you’ll never forget it.

　 A. amusement　　　 B. happiness　　 C. fun　　　　 D. thrill