---Tell us, Mark, what is the cause of the American Civil War?
---Well, is it _______the black slaves wanted freedom?
| A．how | B．why |
| C．because | D．when |
China's badminton superstar Lin Dan won a thrilling final for his fifth world champion in Guangzhou on Sunday over Lee Chong Wei, who ______ his game due to injury.
| A．concerned | B．recovered | C．abandoned | D．recognized |
The biggest whale is _____ blue whale, which grows to be about 29 meters long—the height of ____ 9-story building.
| A．the; the | B．a; a | C．a; the | D．the; a |
-- My parents are preparing my favorite dishes. Go with me and have a taste, okay?
-- ______. And I’ll be glad to meet your parents.
| A．I think so | B．I hope so | C．I’m sure | D．I’d love to |
Don’t blame the worker. He just carried out the order______.
| A．as told | B．as are told | C．as telling | D．as they told |
----- Where will I put the MP4?
----- Put it ______ we can all see it.
| A．when | B．since | C．where | D．unless |