Thank you for your fruitful hinting, nice gaijin

I actually am embarrassed that had such mistake and used "seat" instead of "sit".
I have to say, my English is not perfect, and sometimes have a few errors in my writing. Sadly the specified time for editing my post expired and I can't change the word. So I ask one of the moderators to do that.
You pointed to another mistake and told me that I use " white house" instead of " white palace". In our country " white house" is called " Kakh-e- sefid" which "kakh" does mean " palace" and "sefid" "white"; so the translation of "Kakh-e-sefid" is " white palace".
Nonetheless, I usually used White House in my English writings but in this case the Farsi phrase came in my mind.
Basically, "whit house" can be an unspecified and uncertain phrase, because it does mean " every house that is white", but when "White Palace" is used, it is obvious that we are talking about a palace that only exists in America. Plus, White House is very bigger and more luxuriant than to mean a house and it is just similar to a royal palace. However, I will use White House hereafter.
I also thank you that you learned me the new phrase "oval office". I basically am interested to develop my English and every new word or phrase increase my knowledge.
Anyhow, I will ask one of the moderators to modify what you critiqued.
Thank you