As I will be away for at least a year, I’d appreciate _____ from you now and then so that I can know how everyone is getting along.
--- 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.
The two sisters are ________ different in character --- one talks a lot while the other is a girl of few words.