It was not until the subprime loan crisis(次贷危机) ____ great damage to the American financial system that Americans ____ the severity of the situation.
Lucy is a very optimistic girl. ______ she is faced with a difficulty, she always sees the bright side.
Late in the afternoon, they arrived at ______ small village ______ north of the West Hill.
Along the way children ______ long wool coats stopped to look at us.
Is this the reason _____ at the meeting for his carelessness in his work?
______ in his studies, he didn't know that all the others had left.