First, it's quicksilver (one word). Offhand, I can't think of any collocations where quick would work and the others won't. Still, people will usually say things like "fast lane", "speedy recovery", "rapid decline" etc.
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Ivanhr
MUSCOVITE(1) My watch is two minutes fast.Only fast can be used in this context? ( The other two adjectives wont work here I guess?)Yes.
MUSCOVITE2) Which of the following versions sound natural to you?a fast rocket/airplanea quick rocket/airplanea rapid rocket/airplaneI'd use only the one with fast.
MUSCO