The passengers cheered when the yacht ____.
A. pick up speed
B. picking up speed
C. picks up speed
D. picked up speed
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AIDS is the biggest health _______ we have had to face this century.
A. challenge
B. challenges
C. concept
D. point
The rain was so heavy and the road so muddy that it took us all day to reach our _____.
A. destination
B. track
C. distinction
D. terminal
All her students agreed that she was a(n) _______ and caring teacher.
A. qualified
B. generous
C. mean
D. inspired
It seems that the little boy could never forget the terrible experience in his _________ school.
A. necessary
B. satisfactory
C. elementary
D. prelimilary