—Who______ it be that is knocking at the door? —It ______ be Father, but I’m not sure.
No one can prevent the plan _____________.
It isn’t an excuse for your failure ___________ you didn’t know the rules
_____________ we all know is that destroying nature means destroying ourselves.
Fortunately, I was just _____________ to catch the last bus to the hotel.
There is a peaceful and calm _____________ in the hall, and everyone seems to be in high spirits.