已知9a^m+nbⁿ⁺¹与﹣2a^2m﹣1b^2m﹣1的积与5a⁶b⁶是同类项，求m，n的值．

图中M是世界海上运输最繁忙的著名海峡之一。该海峡是（　　）

①国际社会的斡旋_______，国内各政治派别的克制，终于使乌克兰顺利地进行了新的总统选举，从而避免了一次严重的政治危机。

②中央电视台“百家讲坛”播出后，众多专家的精彩演讲，使广大电视观众进一步______了中国文化的博大精深。

③市区二手房基本上是小户型的单元房，______三五十平方米的一室一厅房在交易中引领市场风骚。

    Do you know Stephen Hawking? He's one of the most well-known____（scientist）on space and time in the world. He was born in England in 1942. Hawking is ____（study）how the universe began and how it ends.

    When he studied math and science at Oxford University, he fell____(serious) ill, which made him unable to speak or breathe. Till now, he can't move or feed____(him). however, he has a wheelchair with ____ special computer, with which he can communicate with others.

    ____he was facing all these difficulties, he refused to give up his hope of living. Because____ his illness, it was difficult for him to draw diagrams or to write. So he started____(think) in pictures. With this new way of thinking, he is respected by people in the world.

    Once he____(invite) to China to give lectures. His self-confidence and humorous conversations impressed us deeply.

    He once said, “When something unfair happens,____ is no need to worry about it! You just have to do the best in your own situation.”