How come you stepped into the lab with your shoes on ? You’re to take them off before you enter it . I told you so !
When you come into the exhibition hall,you can see a large board with a notice on it,saying visitors__________not to touch the exhibits.
—Has William finished writing his graduation paper yet?—I don’t know exactly,but he __________all day.
—Would you like to tell me what our teacher said just now?—She said that light__________faster than sound.
—Did you telephone the manager’s office?—Yes,he__________back before 9 o’clock this morning.
You can certainly leave the classroom as soon as your homework__________.