How do I address a letter to a lady and gentlemen?

What if a friend sits on your lap? How do you turn down a guy nicely for a date? How do you say Formal hello in Russian? What does it mean when someone says someone is gone? What is your welcome in french? What does mandoo mean? What word means to make someone angry or annoyed on purpose - It also means trying to make a situation worse or 'stir' things? Who greets people in an office? Is it okay to wear brown leather shoes or boots with a black wool coat? Can ms mean married? How do you sign a baby shower card? Are you really giving respect to your freedom? What is the meaning of kick the scum out? Is it ok to wear briefs in the locker room? What does it mean when you call someone sugar britches? What does mates means in french? How do you call the seat in dining table where the head of the family or the king seats? What is a French cuff on a dress shirt? How do you address an evelope to a couple when you want to say both names? What does et vous êtes très gentille mais le meilleur c'est toujours Dieu je sais le que tu dise mean in inglesh?