By the time they got to the quake-stricken area, the rescuers___________what difficulty they would have helping the victims out.
In the USA, Columbus Day is_______ the _____ of Christopher Columbus in the New World.
According to the police, _______ some facts undiscovered.
Recent pressure at work may________ his behavior. A.accounts for B. pay for C. stand for D leave for
The twin towers fell down. It looked_____ a huge piece of chocolate had been melted down(溶化).
The money is to be used________the poor.