The word you want is you'd.
Messrs is already the abbreviated form of Messieurs.
Manager is abbreviated Mgr.
In MLA style headings, the month of March is not abbreviated. The months of May, April, June, and July are also not abbreviated.
You mean "What is FM the abbreviated form of?"? You can't abbreviate "fm". FM is the abbreviated form of "Frequency Modulation".
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UTIL is often used as an abbreviated form for UTILITY. Sometimes, UT is also used as an abbreviated form for UTILITY.
The abbreviated form for professor is prof.
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That IS the abbreviated form.
There is no "contraction." There is a short form or abbreviated form, which is "mime."