During the last three decades,the number of people participating in physical fitness programs ________ sharply.
Hearing the sound of shots, the birds flew away ______ all directions.
——How is it that you are late for class again? ——________.
The accident ______ for a new car. Because the old one was destroyed.
The two brothers carried a ______ bed into the room.
It is difficult for you to ______ what will happen in space without gravity.