麻烦各位高手解答这6道题目,高分.

麻烦各位高手解答这6道题目,高分.本人3月 参加自主考, 是名 三校生, 三月的卷子有些难度,从老师那里拿了2份 模拟卷做,检查过答案后,发现这些是错的,老师时间有限 不能全部解答,所以来这里讨教, 谢谢了. 麻烦 给的 解释能 稍微 详细些.1,In all kinds of competitions,jack ___ a most excellent athlete.He has won so many gold medals. A.practises B.conducts C.behaves D.proves. （key:D. 请问该 如何翻译,C行嘛,prove除了证明的意思 还有别的?）2,If the speed ___ you drive your car is beyond the limit, you will be punished. A.by which B.at which C.for which D of which (key B)3,There is much chance ____ Bill will recover from his injury in time for the race. A.that B.which C.until D.if key A.. 选 D 可以嘛.4,Where did you find the wallet? It was at the stadium ____ i played football.A.that B.where C.which D.there key A.. 为何B 不行, 从句部分 主谓完整啊.5,At the meeting they discussed three different ____ to the study of maths.A.approaches B.means C.methods D.ways. key A.. 请给详细的 辨析.!6.Do you think ____ seems to be any need to wait any longer?A.what B.there C.it D.that 答案 B . 为什么不是C. （it seems to be）.