There has been an exciting new technological break _____ .
A. about
B. through
C. down
D. for
A. about
B. through
C. down
D. for
A. with, on
B. on, on
C. at, in
D. at, on
A. in, for
B. on, for
C. at, for
D. on, of
A. for, on
B. for, in
C. for, at
D. for, with