—Are these buses? —Yes, A. it is B .they are C. these are.
They went out for a walk at night, _______ ?
The woman asked the man _______.
—My mother _______ us stories when I was young. —How interesting!
—Wish you good luck in this English exam. —_______
—Is that girl in red ,Sally? —No, it_______ be her. She has gone to Hong Kong.