Regarding when to spell it out and when to use the abbreviation, this is a matter of the level of formality of the document. Some "common" abbreviations are acknowledged in contexts in which most abbreviations would not be, like "and many others. When many people think about fruit juice and https://does-ginger-ale-have-caff08753.wikilowdown.com/6154365/the_5_second_trick_for_does_ginger_ale_have_caffeine