The most widely accepted theory about the beginning of drama is based on the concept ______ drama evolved from ritual.
| A．which | B．that | C．when | D．as |
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 |
You must learn to consult your feelings and your reason________you reach any decision.
| A．although | B．before | C．because | D．unless |
I took my driving license with me on holiday，________I wanted to hire a car.
| A．in case | B．even if |
| C．ever since | D．if only |
________ that Marie was able to set up new branches elsewhere.
| A．So successful her business was |
| B．So successful was her business |
| C．So her business was successful |
| D．So was her successful business |
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.
| A．so long as | B．as much as |
| C．as long as | D．as well as |