_________ some mammals came to live in the sea is not known.

A．Because they didn’t believe the aid groups.
B．Because they were worried about the safety of the aid groups.
C．Because some members of the aid groups became the victims of tsunami.
D．Because they wanted to win the support of the tsunami survivors.

A．The car was too old.
B．The car driver was heavily drank.
C．The policeman needed a car.
D．The car driver broke the speed limit.