—I just wonder that made Mark Twain so famous a writer.
—Of course his early experiences.
| A．it was what | B．what he did | C．how he did | D．what it was |
________ many times, he finally understood it.
| A．Told | B．Telling | C．Having told | D．Been told |
—The weather isn't good enough for an outing，is it?
—Not at all. We can't have ________ at this time of the year.
| A．a worse day | B．a nicer day |
| C．such bad a day | D．so fine a day |
The other day, my father drove his car at ___ I thought was a dangerous speed.
| A．as | B．that | C．which | D．what |
—How much do you know about the 3D film technology?
—A little. Not until _____ the hot movie Avatar______some about it.
| A．did I see; did I begin to learn |
| B．I saw; I began to learn |
| C．I saw; did I begin to learn |
| D．did I see; I began to learn |
All possible means ______. However, nothing can _____ his wife dying of lung cancer.
| A．has tried; stop | B．have tried; keep |
| C．have been tried; prevent | D．has been tried; stop |