Hie risk of heart disease is a powerful argument ___________ smoking.
.What a pity! He got nothing in ______ for his hard work.
.______ your timely warning, we would have been unaware of the danger.
.The question then ______ that the supply of drinking water in the mountainous area is serious.
.We could hardly believe what she says because she is ______ changing his mind.
.. —OK, $ 500, but that is my last offer.—_______.