—There is somebody at the door. Who ___________ it be? Is it the postman?—No. It can’t be him. It’s just seven o’clock. It’s too early.
---Do you mind my taking this seat? ---______.
There are many tall trees on ______ side of the street.
Last weekend, an English short play was _____ in the second hall.
Few people knew how to use the Internet in the past,_____?
—What should we do before we use the blender?—I think we must read __________.