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.

设$a=\frac{4998}{4999}$，$b=\frac{6665}{6666}$，$c=\frac{9997}{9999}$，那么____  ＞____ ＞____ ．