“Look at these tracks. It _______ be a wolf.” “Don’t be so sure. I think it _______ be a fox.”
_______ the normal condition, he can read 150 words a minute.
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.