先化简，再求值：$\frac{a^2-1}{a^2-a}$÷（2+$\frac{a^2+1}{a}$），其中a=$\sqrt{2}$．

2016年8月20日，盐城籍作家曹文轩获得世界儿童文学最高奖项——国际安徒生奖，国际安徒生奖每两年评选一次，被誉为“小诺贝尔文学奖”。曹文轩认为“没有悲伤的童年没质量”他说，《卖火柴的小女孩》大家都喜欢读，这篇文章就是悲剧。曹文轩的话启示我们（    ）

把反义词找出来写在括号里。

①小鸭子的脚用力往后一蹬，身子就向前游去。

____——____

②老艄公撑船很吃力，鲁班做出了橹板后，老艄公就省力多了。

____——____

增加：在缺词处加一个漏字符号(∧),并在其下面写出该加的词。

删除：把多余的词用斜线( \ )划掉。

修改：在错的词下划一横线,并在该词下面写出修改后的词。

注意：1）每处错误及其修改均仅限一词；

2）只允许修改10处,多者(从第11处起)不计分。

    I am writing to ask for whether you are able to do me a favor. I want to have a pen pal, hopefully a girl in the early twenties, and with interests similarly to mine. In my mind, he is someone interesting in traveling, swimming, and playing table tennis. Beside, it will be better for her to have a pet dog as I have been keeping one at home for some time. With such pen pal, I hope I can share with her my experiences in traveling, taking care of pets, or whichever we have in common. I believed I will improve my English by doing so and learning more about her country. I am looking forward to hearing from you soon.