47. A. NO CHANGE
B. undercuts any demanders
C. undercut any demand
D. and undercut the demand
48. F. NO CHANGE
G. the daringest
H. the most daring from
J. the more daring to
49. A. NO CHANGE
B. design of construction of the elevator
C. elevator's design
D. elevator
50. F. NO CHANGE
G. if the cable had broken.
H. when the cable was breaking.
J. had there been a cable break.
51. A. NO CHANGE
B. whom is
C. whose
D. his
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