A．They used the box for keeping treasures.
B．I stepped aside for her to get in first.
C．For all that he seems to dislike me, I still like him.
D．The parents bought a birthday cake for their son.

A．New machinery were introduced in the factory.
B．Poultry are very expensive in the city.
C．The police are investigating the murder case.
D．The militia were called out to rescue flood victims.

A．concerning
B．for
C．as to
D．because of