11.In those days,executives expected to spend most of their lives in the same firm and,unless they were dismissed for ____, to retire at the age of 65.

　　A) integrity

　　B) denial

　　C) incompetence

　　D) deduction

　　12.Others viewed the findings with ____, noting that a cause-and-effect relationship between passive smoking and cancer remains to be shown.

　　A) optimism

　　B) passion

　　C) caution

　　D) deliberation

　　13.The 1986 Challenger space-shuttle ____ was caused by unusually low temperatures immediately before the launch.

　　A) expedition

　　B) controversy

　　C) dismay

　　D) disaster

　　14.When supply exceeds demand for any product,prices are ____ to fall.

　　A) timely

　　B) simultaneous

　　C) subject

　　D) liable

　　15.The music aroused an ____ feeling of homesickness in him.

　　A) intentional

　　B) intermittent

　　C) intense

　　D) intrinsic

　　16.I bought an alarm clock with a(n) ____ dial,which can be seen clearly in the dark.

　　A) supersonic

　　B) luminous

　　C) audible

　　D) amplified

　　17.The results are hardly ____;he cannot believe they are accurate.

　　A) credible

　　B) contrary

　　C) critical

　　D) crucial

　　18.This new laser printer is ____ with all leading software.

　　A) comparable

　　B) competitive

　　C) compatible

　　D) cooperative

　　19.The ball ____ two or three times before rolling down the slope.

　　A) swayed

　　B) bounced

　　C) hopped

　　D) darted

　　20.He raised his eyebrows and stuck his head forward and ____ it in a single nod,a gesture boys used then for O.K. when they were pleased.

　　A) shrugged

　　B) tugged

　　C) jerked

　　D) twisted