Paul had to write a history paper, _____ he couldn’t find time to do it.
---- Sorry, I have to ______ now. It’s time for class. ---- OK, I’ll call back later.
Before a problem can be solved, it must be obvious ______the problem itself is.
In the global economy, a new drug for cancer, it is discovered, will create many economic possibilities around the world.
Shortly after suffering from a massive earthquake and to ruins, the city took on a new look.
The president of the World Bank says he has a passion for China , he remembers starting as early as his childhood.