—Who______ it be that is knocking at the door? —It ______ be Father, but I’m not sure.
__ was my head teacher, Miss Liu, that read several inspiring stories to encourage me to go on.
We must know what we should do and what we should avoid _______ a good impression on others in public places.
They had to ______ the meeting because the organizers didn’t prepare the hall well, where people can share their opinions and hold discussions.
Nowadays many women are _____ their late twenties or early thirties when they have their first child.
I know that if I start watching a soap opera, I immediately become hopelessly _____.