The number of medical schools reached 18 in the early 1990s and ______ around that level ever since．（ ）
| A． |
are remaining |
B． |
have remained |
| C． |
is remaining |
D． |
has remained |
She always comes to our help when we get into trouble____ she is very busy.
| A．ever since | B．once |
| C．even if | D．so that |
Prince William will be fiercely protective of his new son to make sure he has a chance of a “normal” family life, ________happens in Royal circles.
| A．however | B．whatever |
| C．wherever | D．whichever |
The young couple, who returned my lost wallet, left _______ I could ask for their names.
| A．while | B．before |
| C．after | D．since |
—I wonder how much you charge for your services.
—The first two are free the third costs $30.
| A．while | B．until |
| C．when | D．before |
It is hard for the Greek government to get over the present difficulties_________ gets more financial support from the European Union.
| A．if | B．unless |
| C．because | D．since |