The World Health Organization gave a warning to the public without any ______when the virus of H1N1 hit Mexico in April, 2009.
Come and see me whenever ________.
________ by the growing interest in nature,more and more people enjoy outdoor sports.
___around the Water Cube, we were then taken to see the Bird’s Nest for the 2008 Olympic Games.
____ succeed in doing anything .
The day he had been looking forward to _____at last.