Dr. Hooper at Michigan United Hospital is the world's______authority on knee replacement surgeries.（）

Althea Corporation______by many analysts to be the most innovative software company in the industry.（）

A．considerably
B．consideration
C．is considered
D．was considering

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It is still unclear______the Mayor will accept the recommendations of the City Council.（）

A．yet
B．about
C．before
D．whether

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