---There is somebody knocking at the door. Who________ it be?---I’m not sure. It ________ be a postman.
It’s five o’clock. My children______
The teacher tells us not ______a hat in class.
Don’t run in the hallways. ______,I won’t do it again.
______play computer game s after school.
______do you think of your teacher? A. How B What C. Which D. Where