Which sentence uses except or accept correctly?

Question

Please except my apologies; it was my fault
Thank you, I will gladly accept your offer***
Winter is my favorite seasons accept when it snows
I cannot except this gift , because it is too expensive

Which sentence is written correctly?

Sometimes when the weather, is
especially cold we get snow as early as October 31
Sometimes when the weather is especially cold we get snow as early as October 31
Sometimes, when the weather is especially cold, we get snow as early as October 31***
Sometimes when the weather, is especially cold we get snow as early as October, 31

Answer 1

1. I agree.
2. I agree if there's a period after "31" http://www.chompchomp.com/terms/completesentence.htm