least
                    - His explanation was so clear that everyone could understand it with ________.
 - Students need at least eight hours to sleep, or they are_______ in class.
 - If you ______go,at least wait until the rain stops.
 - Everyone needs to have at least eight hours’ sleep a night, so you shouldn’t ______ too late.
 - I suppose you are at least 60 years old.- Thank you. I’m glad you______ that. My real age is 362.
 - If you __ go, at least wait until the storm is over.