Dialogue.
letters between a wife and her husband
A letter between a man and a woman who are dating.
Why were the letters written? -
A set of letters is normally called an alphabet.
A complete set of original letters from a century ago
It is most likely to be the arithmetic mean.
The range.
Instructions on how to set up an e-mail account is the type of information most likely to be in a procedural document.
A really great joke
most likely you will use the boomerang
C.First, then, now
Most likely eBay.