问题补充：
I want to have a pen friend, hopeful a girl in her early twenties, and with interests similar with mine. In my mind, she is someone who are interested in travelling, swimming, and play table tennis. Besides, it would be better for her to have pet dog as I keep one at home for some time.
Although we are thousand of miles away from each other, but I can share with her our travelling experiences, taking care of pets, or whatever we had in common. And I believe I will improve her English by doing so and learns more about her country.hopeful 改为hopefully
答案：
(答案→)hopeful 改为hopefully
解析：
【小题1】修饰动词，故用副词形式。
【小题2】similar to是固定用法，与……相似，所以with 改为 to。
【小题3】先行词是不定代词，故谓语动词用单数，所以are 改为is。
【小题4】be interested in，其中in是介词，后面用动词的-ing形式，所以Play改为playing。
【小题5】表示“一只宠物狗”，所以pet dog前加a。
【小题6】后面有of，所以Thousand改为thousands。
【小题7】Although与but不能连用，所以but 去掉。
【小题8】表示经常或反复发生的动作，用一般现在时。
【小题9】句意：我相信我会提高我的英语。her 改为my
【小题10】and连接并列结构，所以learns 改为 learn/learning。
