Classification is a useful ______ to the organization of knowledge in any field.
#7303
A
means
B
approach
C
mode
D
manner
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He is ______ as a leader but he hasn't ______ in teaching.
#7066
A
success; many experiences
B
a success; much experience
C
great success; an experience
D
a great success; an experience
It is reported that the ______ in Libya is hotting up. 
#6231
A
strength
B
violence
C
power
D
activity