Ответ:

I begin the letter that I am very glad that he wrote me letters and ask him questions.

At the end of a letter to close people, I usually ask questions that interest me very much.

At the end of a letter with a stranger, I try not to write a lot, but to ask only clear questions that are required for dating.

The most important thing in a letter is when I answer the interlocutor's questions in expanded form.