连词成句，并加上标点。

①一位  有  的  围棋  下 能手

②学生  一个   出色  成了  棋手  的

    Mr. Smith is my new friend. He1from Paris, France. He is a French2of a middle school. His students all like3very much. He can speak some Chinese,4not much. He wants to learn more, so he goes to5 classes every week. He likes living and working6China very much. He7 the Chinese people are very friendly(友好的). He has two8, Maria and Tom. They are students, but they go to different(不同的)9. They have some pen pals and they often write10 the pen pals. They also have many Chinese friends at school and they play games after class.

提出“大陆漂移假说”的科学家是（　　）

在数列{a_n} 中，$a_1=\sqrt{2}-1$  ，前n项和 $S_n=\sqrt{n+1}-1$ ，先算出数列的前4项的值，根据这些值归纳猜想数列的通项公式____