This book is __________ I can't read it.
| A．such difficult that | B．so difficulty that |
| C．such difficulty that | D．so difficult that |
I found Jane________at the desk，________her homework carefully.
| A．seated；doing | B．sitting；does |
| C．be seated；does | D．sit；do |
Much to our surprise，the witness’s________of the traffic accident differed from the official version in several aspects.
| A．account | B．opinion |
| C．instruction | D．explanation |
China is developing fast.That’s________I think those of my colleagues who deal with China affairs should visit China.
| A．because | B．why |
| C．when | D．how |
Our bad living habits will destroy the earth.Only by changing________we live can we save the earth.
| A．that | B．what |
| C．how | D．where |
It was only when I reread his poems recently________I began to appreciate their beauty.
| A．until | B．that |
| C．then | D．so |