They won't let him out of the hospital ________ he's completely recovered.
| A．since | B．until |
| C．if | D．as |
Many experts hold the view _____ teacher development is ____ the key to better education lies.
| A．which; where | B．which; in which | C．that; where | D．that; in which |
_____ that he has no qualifications in business management, Ken plans to gain the necessary skills by taking a part-time course.
| A．Concerning | B．Concerned | C．Being concerned | D．To concern |
The river _____ banks used to be covered with fruit trees and flowers is now seriously polluted.
| A．of which | B．along which | C．where | D．whose |
| A．is killing | B．kills | C．was killing | D．killed |
--How did you do in the test?
--Not so well. I ____ much better but I misread the directions for Writing.
| A．will have done | B．could have done | C．must have done | D．may have done |