How kind you are! You always do what you can ______ others.

Not until he promised to return it to me as soon aspossible ____ my electronic dictionary to my classmate.

The boy is waiting ____ his sister and they will go to the hospital to wait ____ their sick mother

Math teacher David Benke said he had no time____his life when he stopped a man shooting at students

________the police thought he was the most likely one，since they had no exact proof about it，they could not arrest him.[ ]