The H1N1 flu spread very quickly at the beginning, __________, many people were ill.
| A．therefore | B．instead | C．in advance | D．however |
Over the past decades, sea ice _____ in the Arctic as a result of global warming.
| A．had decreased | B．decreased | C．has been decreasing | D．is decreasing |
After some time in the dark cave, our eyes slowly _____ the dark.
| A．used to | B．adapted to | C．accustomed to | D．helped to |
Seldom out time to watch TV on Sunday.
| A．I can squeeze | B．can I squeeze | C．squeeze I | D．I squeeze |
Steven Hawking’s conclusion about the Black Hole is a little , but it has been accepted by most of the world.
| A．realistic | B．abstract | C．contemporary | D．appropriate |
_____ matters most in learning English is enough practice.
| A．what | B．why | C．how | D．Which |