1) Flying cars would be especially useful in cities _______ with traffic.

A. joined B. crashed C. congested D. exhausted

They were _______ because of the poor quality of their equipment.
A. success B. successful C. unsuccessful D. successfully
 

_______, I think flying cars will become a reality.
A. Personal B. Person C. Personally D. Personality
 

Solar, wind, and hydro are renewable and _______.
A. exhausted B. exhaustible C. inexhaustible D. exhausts
 

Flying cars would be especially useful in cities _______ with traffic
A. joined B. crashed C. congested D. exhausted
31. Teleporters make you _______ and the reappear at your destination.
A. appear B. disappear C. to appear D. to disappear
32. Who is the ______ of the flying car?
A. invention B. inventor C. invented D. inventing
33. They were _______ because of the poor quality of their equipment.
A. success B. successful C. unsuccessful D. successfully