Today’s young people can’t live without smart phones. They keep their hands on the phones whenever they go, even while they_______meals.

(2013 .益阳)– How old is your daughter?-_______. We had a special party for her_______ birthday yesterday.

Class regulations state _____ is the last to leave the classroom _____ off all the lights.

Could you tell me_________?—He is in the library．

How____ is the population of the world?