—Who______ it be that is knocking at the door? —It ______ be Father, but I’m not sure.
The two books are _______ same size, and similar _______ content.
In the dark forests , some large enough to hold several English towns.
He got up late and hurried to his office, ___________ the breakfast _________.
Mary is giving me English lessons__________my teaching her Chinese.
---Are you satisfied with the result ? ---Not at all. ______.