下面这句子有哪些语法错误studying in such noisy dorm is unwise...so when I want to study I will not hesitate to study in the classroom or in reading room...to my happy ,I have inproved my listen comprehension

studying in such a noisy dorm is unwise
so when I want to study I will not hesitate to study in the classroom or in the reading room.
.to my happiness , I have inproved my listening comprehension
需精修。。

hesitate to +doing;
to my happy:这是什么？最好换成what makes me happy is that I have ...my listening comprehension.

Studying in such a noisy dorm is unwise So when I want to study ,I will not hesitate to study in the classroom or in reading room...to meet my need ,I have improved my listening comprehension skills