In case it thunders, we’d better _____________ the electricity at once and turn off the TV.
The textbooks ________ for teaching English as a foreign language came out in the 16th century.
If the wound _______ become swollen, do not hesitate to call me.
He ______ to get out of trouble, but no one would help him.
Our class _______ more than 70 students.
No bird and no beast _________ in the lonely island.