0In "proper" conversational and written English, the first three should all be "quickly" (though some dialects might use "quick"). In #3 more people of all persuasions might say "quick" in conversation, or even in informal writing (though never in formal writing). 02br 02br 00Given the way you've punctuated #4, this, again should be "quickly" in "proper" English in my opinion.
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