Effective measures should be taken to ______ the rare species _______ being over-killed by human beings.
| A．keep; against | B．prevent; from |
| C．stop; against | D．protect; from |
Paul was not allowed to work he was fully recovered from the flu.
| A．even if |
| B．whether |
| C．because |
| D．until |
She cared more about her students than her own health. That’s why two years passed _____ she was treated for breast cancer.
| A．since |
| B．before |
| C．after |
| D．until |
It was 1995 __________ we began to develop the new computer system.
| A．when |
| B．which |
| C．since |
| D．that |
Tom is good a studenthe is often praised by the teacher.
| A．such; as |
| B．so; as |
| C．such; that |
| D．so; that |
If this bridge can't be repaired, ____ will mean no food will be transported to the flooded areas.
| A．what |
| B．it |
| C．as |
| D．which |