In Indefinite articles^x, Abbreviations^x

Mister Micawber, I've got two more question to you.Which one of these two construction (is worth attention/is worthy of attention) is more frequently used?Do we use the indefinite article before the abbreviation like (an) MBA essay or (a) GCSE coursework?Many thanks.

Believer wrote:I have a sentence I think I saw written somewhere. How would you rewrite it so it is correct? I think it is incorrect. Our company has a children's center for our employees in need of child care. I can't see a problem with this sentence otherwise. The indefinite article is...

Hi, you asked Which is the correct usage please: " I have ordered a / an MRI (magnetic resonance scan) and will review the patient following this." Rule: With single letters and groups of letters that are pronounced as individual letters, be guided by the pronunciation: a B road, a TUC leader;...