______， a sleepy driver killed twenty－two students and teachers in a traffic accident in Shanxi Province.
| A．What's more | B．After all |
| C．Believe it or not | D．More or less |
（2013·辽宁卷)One can always manage to do more things，no matter full one’s schedule is in life.
| A．how | B．what | C．when | D．where |
He is so busy. He cannot afford enough time with his son _______ he wants to.
| A．even if | B．as if | C．because | D．before |
Mark needs to learn Chinese _______ his company is opening a branch in Beijing.
| A．unless | B．until | C．although | D．since |
_________I have to give a speech, I get extremely nervous before I start.
| A．Whatever | B．Whenever | C．Whoever | D．However |
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 |