单项选择题

We must try to ______ the best of our moral values for our children and grand-children.

A．replace
B．remain
C．generate
D．preserve
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单项选择题
______ is the question of using existing resources to produce original and beneficial solutions, ideas or products.
A．Creativity
B．Productivity
C．Application
D．Combination
单项选择题
He was seriously injured in a car accident, which was ______ to faulty brakes.
A．attributed
B．contributed
C．blamed
D．applied
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