—Who______ it be that is knocking at the door? —It ______ be Father, but I’m not sure.
Sometimes I can’t help wondering what’s the matter with Tom.I can’t stand it that he often_____ me and talks with the other students around him.
______ these models several were exciting, ____ of them exactly right.
—Did you reach the top of the mountain?—Yes. Even I myself didn’t believe I could it.
His aunt’s letters him of those beautiful days when they used to live together in his hometown.
He has been fired and will have to over charge of his office tomorrow.