---Have you finished your homework _______ ?    ------- Not ______.

I knocked on the door but ________ answered.

—          will it take? I have little time left.— Don’t worry. It won’t take you much time.

―Look at the lady there. ______ it be Mrs. Green?―No, it _______ be her. She left for London this morning.

The students are doing the cleaning in their classroom. Some are cleaning the windows and the doors, _______ are sweeping the floor.