______ in thought, he almost ran into the car in front of him.
| A．Losing | B．Having lost | C．Lost | D．To lose |
In the global economy, a new drug for cancer, it is discovered, will create many economic possibilities around the world.
| A．whatever | B．whoever | C．wherever | D．whichever |
Shortly after suffering from a massive earthquake and to ruins, the city took on a new look.
| A．reducing | B．reduced | C．being reduced | D．having reduced |
The president of the World Bank says he has a passion for China , he remembers starting as early as his childhood.
| A．where | B．which | C．what | D．when |
Anyone, once ____ positive for H7N9 flu virus, will receive free medical treatment from our government.
| A．to be tested | B．being tested | C．tested | D．to test |
Evidence has been found through years of study______ children’s early sleeping problem likely to continue when they grow up.
| A．why | B．how | C．whether | D．that |