How boring today is!
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Today I woke up at 07:30.Then I got up and brushed my teeth and washed my face and washed a pair of crousers and a pair of socks.After hung them up,I started my notebook PC and entered the game,Killers of Three Kingdoms.But there was a low Internet speed.When it just was my turn,I was off line...>_<...Oh,no!How terrible it was!My teammates might be killed due to my escape!

How boring today is! / What a boring day! / Today was such a bore.
After I got up, I brushed my teeth and washed my face. Then I washed a pair of trousers and a pair of socks.
I split the sentence because you're doing 2 separate activities. First you washed up after waking up, so I grouped those together. Next you did some laundry, so I grouped those. It's like grocery shopping, they pack the frozen food in one bag and detergent in another!
After hanging them up, I turned on my notebook PC and entered the game, Killers of Three Kingdoms.
But the internet speed was so slow.
"So" is used as an adverb here, meaning 'to a great extent'.
When it was finally my turn, I was off line... >_<... / I had lagged out.
I don't really know your meaning? But I'm thinking you lagged out! Haha
Oh, no! How terrible! My teammates might have been killed due to my sudden departure!