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
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