Проверьте,пожалуйста,на оплошности Dear Ann,Thanks for your letter.So,my best friends name

Проверьте,пожалуйста,на оплошности
Dear Ann,
Thanks for your letter.
So,my best friends name is Dima. He is a very helpful,caring,smart and ,definitely ,handsome boy . I met with him in school in the fifth grade in the second quarter. We are in the same class and sit together at school desk in many lessons. My very solid relationship with him began in 6 grade.
It's not uncommon for us to finish sentences each other's.
We cannot do without each other.
Usually We spend our time wandering the streets and talking about different things.
To be honest, We were arguing a lot but put up . I'm glad I have such a wonderful friend!
Write back soon,Please.
Best wishes,
Sonya