—Who______ it be that is knocking at the door? —It ______ be Father, but I’m not sure.
When and where to build the new factory _____ yet.
I have many friends, ________ some are businessmen.
School children must be taught how to deal with dangerous ________.
The survey shows that ______ of the population in the country ______ adults.
The workers do nothing but _______ tea and talk to each other.