英语短文改错：

写得不错。小地方改改就好：

Your problem is a common one among middle school students. Maybe the following advice can help you. First of all, believe in yourself. Your greatest problem is that you lack self-confidence. What you must do is to smile at your classmates. One smile speaks louder about your wish to make friends than any words.Your smile will show that you are friendly to them. Next, try to talk with a student who is as shy as you or who shares the same interest with you.You can discuss your studies with a classmate and  you can also talk about your hobbies. When someone is in trouble, you should be ready to help him or her. Once you have confidence, you can make as many friends as you want.

first in all改为first of all.....you must do it is删去it,,,,,unless改为if......possibly改为possible

保证答案准确！
Dear Jin Jing,
Your problem is ( 加上a )common one among middle school students,Maybe the following advices (advices--advice)can help you.First in ( in- of ) all,believe in yourself.Your greatest problem is that you lack self-confidence.the first thing you must do it (it去掉) is to smile at your classmates.one smile speaks loud(loud- louder) about your wish to make friends than any words.Your smile will show that you are friendly to him（him- them）. Next,trying talking with a student who is as shy as you or who share (share- shares )the same interest with you.You can discuss your studies with a classmate and(and- or) you can also talk about your hobbies.Unless (Unless- If )anyone is in trouble,you should be ready to help him or her.Once you have confidence,you can make as many friends as possibly(plssibly- possible)