Many experts believe that teachers' development is ______ the key to better education lies.
| A．that | B．what |
| C．where | D．which |
We are in great want of a more capable monitor，________with straightforward personality as well as good humor.
| A．who | B．the one | C．one | D．which |
No matter how carefully you plan your finances, no one can _____ when the unexpected will happen.
| A．prove | B．imply | C．demand | D．predict |
At the meeting，all the people were deeply________with her brilliant report.
| A．impressed | B．surprised | C．excited | D．comforted |
Mr. Green drove slowly on the way home until he reached the high way, ______ the speed limit was 60 miles per hour.
| A．because | B．which | C．where | D．that |
In my opinion，everyone has periods in their lives________everything seems very hard.
| A．when | B．where | C．which | D．that |