The scientist () that nuclear power was a safe and unpolluted energy source.
A. assured
B. asserted
C. assumed
D. assaulted
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He had hoped to set a new world record, but was () by bad weather.
A. defeated
B. destroyed
C. disappointed
D. frustrated
Have you read the article written by three top medical experts in the latest () of the periodical?
A. copy
B. issue
C. version
D. edition
In recent years a number of () satellites have been put into orbit.
A. communication
B. transportation
C. transportations
D. communications
The () from the balcony was breathtaking: the sea melted into the sky in the distance.
A. perspective
B. prospective
C. prosperity
D. prospect