——Must we finish the exercise today? ——No, you________.
—Listen! Peter is singing in the classroom! —It _____ be him. He has gone back to his hometown.
Keys _______ opening the lock in the door.
—I have never been to the Great wall. —If you have an opportunity _______ there, you must take it.
There was _____ woman in the room, sitting and looking at me in the dark.
-----_______good time we had at the party last night! -----Yes. It was________ exciting party that I would never forget it. A. What a; such an B. How ; such C. What; so