. Dr. Frank failed many times but he finally _______ to find a successful way to solve the problem.
| A．broke off | B．broke out | C．broke down | D．broke through |
Leave your key with your neighbor ________ you lock yourself out one day.(2012·辽宁)
| A．as long as | B．even though |
| C．in case | D．as if |
A number of high buildings have arisen ________ there was nothing a year ago but ruins.(2012·山东)
| A．when | B．where | C．before | D．until |
—Do you have a minute？I've got something to tell you.
—OK，________ you make it short.
| A．now that | B．if only |
| C．so long as | D．every time |
—Have you got any idea for the summer vacation?
—I don't mind where we go ________ there's sun，sea and beach.
| A．as if | B．as long as |
| C．now that | D．in order that |
It is hard for the Greek government to get over the present difficulties ________ it gets more financial support from the European Union.
| A．if | B．unless | C．because | D．since |