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18. It was his wife’s encouragement that had _______ his through the bad times.
A. delivered
B. relieved
C. sent
D. brought
19. The distance from the Earth to the spacecraft is often determined very accurately from the time _______ between two radio signals.
A. interaction
B. alternative
C. interference
D. interval
20. Finding himself trapped in the Death Valley, he had a sudden feeling of _______.
A. despair
B. desperate
C. frightened
D. dreadful
21. In a time of social reform, people’s state of mind tends to keep pace with the rapid changes of society.
A. take step
B. match up
C. keep in touch
D. make progress