____ wide spread of H1N1 is _____ challenge for the whole world. Confidence, cooperation and responsibility are keys to overcoming it.
I've got all her records but I've never seen her_______.
He walked along in the _____hoping no one would recognize him.
They _______to finish the task before July, but they didn’t make it because of the terrible weather.
Tom is a stubborn and careful man; It took many hours to_______ him of my good idea and to give up his.
The monitor wanted to buy two_______ stamps, but the salesgirl only sold him_______ these stamps.