____was known to us all that Johnson had broken his promise____he would give each of us a small gift.
There is little time left, so the chairman asked me to __my speech to 20 minutes.
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.