Yes, Mr. Mrs. Dr. are always have a full stop after them.
Mister
you already answered the first part.
short message service
personal computer or politically correct
No because that is two sentences and they should be separated by a full stop or at least a semicolon: The answers are short; they are correct.
1. Could be short form or slang for "your" 2. Short form for Unrecognized Recipient.
short for ALGOrithmic Language
"Fax" is short for "Fascimile"
Short Message System
It is short for: I don't know
Barry as a name is the full form.
The full form of "Lt" related to teacher is "Lecturer."