【2015·重庆】The meeting will be held in September, but____ knows the date for sure.
____ can be done ____ been done.
Those who _____ in ____ compositions, please hand them in this afternoon.
Not until the child fell asleep_______leave the room.
No sooner_______than it began to rain heavily.
Little did he care about his own safety,_______he was in danger himself.