16. —Who____ it be that is knocking at the door? —It ____ be Father, but I’m not sure.
You didn’t use to like him much when we were at school, ___________?
The way he did it was differentwe were used to .
—Where did you get to know her? —It was on the farm _________ we worked.
My English teacher’s humor was ___make every student burst into laughter.
---Is Jack on duty today? ---It ________ be him. It's his turn tomorrow.