Whoever leaves the room last must___that all the lights are

Whoever leaves the room last must___that all the lights are ____ leaves the room last must turn off the lights. ---------leaves the room last ought to tuan off the lights. _______ leaves the room last ought to turn off the lights ____ leaves the room lastought to turn off the lights. The student left the room [ ]all the lights on. _______leaves the room last should turn off the lights． __leaves the room last ought to turn off the lights. When he went into the room ,he ( ) all the lights whoever leaves the office should tell me. All of the Lights ______who leave the room last ought to turn off the lights.