You can keep all the files and documents you think it is convenient to get them．
| A．what | B．how | C．where | D．when |
. ________ the case is settled out of court, it can often take years before it comes to trial.
| A．Except that | B．Unless | C．Until | D．But for E) Despite the fact that |
. Put on your rain()coat ________ it rains.
| A．because | B．as | C．lest | D．in case E) in condition |
.________ gas leaks and similar accidents should occur, some responsible persons should regularly inspect all the laboratories.
| A．Unless | B．In case | C．Provided | D．Until |
. ________ in one leg, he never had a chance to get a job.
| A．Weak and lame | B．He was weak and lame |
| C．Though weak and lame | D．Weak and lame as he was |
. The production of television commercials must be professional ________ they aim at promoting good service, or public education.
| A．when | B．no matter | C．if | D．whether |