Mrs. Tang teaches ______English. And they like _________ very much.

3∶5＝12∶____＝ $\frac{()}{15}$ ____＝____÷10

根据短文内容从下面方框的7个选项中选出5个还原到文中，使短文意思通顺，结构完整，并将其答案的序号填到相应位置。
Dear Zhang Wei,
   I'm in New York now.____ . My English teacher is good-looking. Everyone in our class likes her very much.
____ . They are Sara, Ben, Nick and Peter. Sara has long straight hair.____ Ben has short curly hair and he can speak French very well, because his mother is a Frenchwoman. Nick and Peter are twins (双胞胎). ____. They can sing well.
What about your school life?____ .
                                                                                                                                                             Yours,
                                                                                                                                                             He Bin

各项均为正数且公差为1的等差数列{a_n}，其前n项和为S_n，则$\underset{n\to \infty }{\lim }\frac{S_n}{a_n·a_{n+1}}$=（　　）

①有利于消除居民收入差距，实现社会公平

②有利于改善人民生活，促进社会和谐稳定

③有利于改变就业中的性别、学历歧视等现象

④有利于劳动者实现自身社会价值，促进全面发展