It took me over two hours to ______ Robert to change his mind, because he was too stubborn.

At the meeting, the old man _____ some good advice about bringing down the market price of housing.

(2013·河北唐山模拟)The bell rang and every student had to ________ their examination papers.

Although he is a well-known star, he never gives others an impression that he is _________ those who play with him.

(2013·泉州质检)In a natural disaster，minutes and even seconds of warning can make the ________ between life and death.