The old lady is reminded to _____ for cars when shecrosses the road.[ ]

Now most teenagers write to each other not by letter ________online.–Yes, the Internet has become a part of their life.

Two—thirds of the money on tents for the homeless people in Wen—chuan

The little boy was to go out alone.

Why are wetlands so important to wildlife— Because it can ______ them with food and cover.