Tomorrow after 2 classes, I will go to Wuhan at half past ten and at 4:15 p.m. I will be on the train to Shanghai. On Oct The abbreviation requires capitalization1st at about 7 a.m., I think I will arrive in Shanghai,but Two independent clauses are being connected by the conjunction; a comma is required there is no seat for me on the train to Shanghai. 15 hours, I can't believe it. Hope it won't kill me. ^_^ 

Is someone in Shanghai? Could you be my guide? Thank you very much. 

Because my friend works in Suzhou, I think I will stay in her house in Suzhou during the national holiday. 

Maybe you will ask me why not I take a train to Suzhou directly? 
Hehe! Because the train to Suzhou is so expensive for me--244 yuan. This phrase seems a bit out of place;  an em dash would be good to use here.
But it takes only Although the statement is clear, the modifier should be placed near the word it modifies 5 or 6 hours to go there.Hehe!

See you, my friends!

I will be here after Oct 7th. 

Take care!!! 

Happy National Day!

Well done! :)