During the past two decades, research has ________ our knowledge of daydreaming.
A
A扩大B浮现、露出C下降D征服
Thefarmingmethodshavebeen________improvedwiththeinventionofthenewmachine.
Peoplewhocan’t_______betweencolorsaresaidtobecolor-blind.
Never before _______ so rapidly developing as it is today.