Albert Einstein’s Special Theory of Relativity was so ______ that only a few scientists could understand.
A. principal
B. premier
C. popular
D. profound
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He has become ______ since he left his parents.
A. martial
B. mature
C. mixture
D. master
Notre Dame De Paris is a ______ example of Gothic architecture.
A. practical
B. perfect
C. prolific
D. public
We had a ______coffee break.
A. fifteen-minute
B. fifteenth-minutes
C. fifteen-minutes
D. fifteenth-minute
Mozart wrote many ______ compositions in his short life.
A. musician
B. musical
C. music
D. classic