What were Helen and Sally doing when it began to rain heavily?
Helen was sleeping _______Sally was reading a magazine.( )
A.whileB.untilC.beforeD.after
-When will you go back to your hometown? - _______.
—What will you do if it _______ tomorrow? —I will stay at home and watch the match on TV.
I wonder when they ___ for Beijing. I will go to the train station to see them off when they ___.
He go to bed until he his homework.
—I don’t know when ______ tomorrow.—I will call you as soon as he ______.