Language in informal letters

In informal letters, the candidate can

However, this is an examination and the candidate should also

There are many openings and closings possible in informal letters, depending on the closeness of the relationship between the writer and recipient:

Dear Harry
Dearest Harry
My dear Harry
My darling Harry
Hi Harry! (often used in emails now)
Love from Liz
Love, Liz
With love from Liz
Lots of love from Liz
Best wishes, Liz
All the best, Liz
See you soon, Liz