The country’s population ______ small, and most of its population ______ in the mountainous areas．
| A．are; lives | B．are; live | C．is; live | D．is; lives |
Scientists say it may be five or six years _______ it is possible to test this medicine on human patients.
| A．since | B．after |
| C．before | D．when |
It was some time _______ we realized the truth.
| A．when | B．until |
| C．since | D．before |
Roses need special care _______ they can live through winter.
| A．because |
| B．so that |
| C．even if |
| D．as |
This photo of mine was taken _______ stood the famous Eastern Bright Pearl in Shanghai.
| A．which |
| B．in which |
| C．where |
| D．there |
You should made it a rule to leave things _______ you can find them again.
| A．when | B．where |
| C．then | D．there |