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

   A) expedition                         C) dismay

   B) controversy                        D) disaster

6. When supply exceeds demand for any product, prices are _______ to fall.

   A) timely                             C) subject

   B) simultaneous                       D) liable

7. The music aroused an _______ feeling of homesickness in him.

   A) intentional                        C) intense

   B) intermittent                       D) intrinsic

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

   A) supersonic                         C) audible

   B) luminous                           D) amplified

5. D 6. D 7. C 8. B