A huge amount of oil was on the road, the effects of are not clear．
| A．it | B．that | C．which | D．whom |
I was advised to arrange for insurance(保险) _______ I needed medical treatment.
| A．nevertheless | B．although | C．in case | D．so that |
—We’re supposed to be there at 6:00?
—_______ I know.
| A．As soon as | B．As far as | C．So long as | D．As possible as |
I thought things would get better, but it is they are getting worse.
| A．before | B．because | C．as | D．after |
Although he knew little about the large amount of work done in the field , he succeeded other more well-informed experimenters failed.
| A．as | B．unless | C．what | D．where |
John waited at the bus-stop for nearly half an hour the bus finally arrived .
| A．when | B．as | C．before | D．while |