The invention of the typewriter was a great_______  to communication and printing.
#6407
A
contribution
B
devotion
C
revolution
D
construction
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.Excuse me, I have no ______ on me. Can you _____ the note of 100 yuan ?
#6591
A
changes, charges
B
changes, change
C
change,change
D
changed, changed
—What does Roger Brown do for a living?—He is one of the most successful________ in the city.
#6948
A
newspaper reporter
B
newspaper’s reporters
C
newspaper’s reporter
D
newspaper reporters