A year later，with the nation’s economy ________，Bush’s approval rating dropped below 40 percent
A、inpowerB
introuble：陷入困境。由于經濟陷入困境，所以支持率下降了很多，符合句意。
Fish is ________ and expensive at this time of the year in this area.
During the past two decades, research has ________ our knowledge of daydreaming.
Thevehiclewastravelingatspeeds________90milesperhour.
Iunderstoodfromherthatyouundertookotherimportantwork______.
Duringthepasttwodecades,researchhas________ourknowledgeofdaydreaming.
