—Who______ it be that is knocking at the door? —It ______ be Father, but I’m not sure.
I don’t want to read all these old newspapers, please tell me where the __ ones are.
---- How did her family feel when you visited them? ---- My coming ________ the happiness of her family.
_________ to 100℃, water will boil.
He __________ his aunt’s when he went to Wuhan on business.
You’d better take something to read when you go to see the doctor __________ you have to wait.