The World Health Organization gave a warning to the public without any ____when the virus of H1N1 hit Mexico in April, 2009.
In the global economy,a new drug for cancer,________it is discovered,will create many economic possibilities around the world.
You must learn to consult your feelings and your reason________you reach any decision.
I took my driving license with me on holiday,________I wanted to hire a car.
________ that Marie was able to set up new branches elsewhere.
Scientists generally agree that Earth's climate will warm up over the next 50 to 100 years ________ it has warmed in the 20,000 years since Ice Age.