Ifthe fon't isn't on your computer then keynote won't have it. All applications use the same font list. If you want a copy of trade gothic you'll have to pay I'm afraid. There two versions, one by Adobe, one by linotype. I don't know which one you want but they are available here +gothic%29/fonts/
"Apple SD Gothic Neo" was designed based on the premium gothic font 'Sandoll Gothic Neo1' which has a super family with various weights. It is a stable and solid font with priority given to usability and readability so that it can be used as a body text font in the multimedia market.
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