英语日记中的错误

英语日记中的错误
roving a writing skill ,i will to write a composition in every week.
If you feel free.Please help me to check the Composition .
Thanks for your help .
Nov.23 thursday sunny
Today ,i'm plan to do homework everyday ,my brother will check me .
At first .thanks for brother's support .i will do my best write more beautiful .hoho
In fact ,my mood is heavy,i feel terrible about i meet in this morning ,severl days ago,i had provied a important file to a customer,i have recevied a letter form Our sales in today.she said :"our mouse sales to the customer is wired mouse,why contain dongle ,please explain it ASAP",according to check ,i was Discovered i got the other fellow's file to coustomer .oh ,my dear ,i made a mistake.
At once .i improved it ,exchange the file,and explain to customer and beg his (谅解)understand .and then ,my Supervisor ask me how to prevent it ,a series Things are coming ,everything i do is for a mistake .my careless let me failure.：(
From now on ,i understand completely ,i must do everything check again and again until 100% right ,i hope my supervisor to give me more encourage,Because everybody could make mistake ,me too .
It's all over ,i don't want talk about it any more .
OK ,today i am write it down to remind me and everyone.