As we all know, it was _________ that resulted in the terrible car accident.
Great changes _______ in his hometown in the last twenty years.
--- How is the lecture going? --- The lecture has ended. You’re ________.
An increasing number of people ________ the importance to physical exercise.
—Who______ it be that is knocking at the door? —It ______ be Father, but I’m not sure.
The teacher will never have Tom away within the exam.