I'll give you a question, please answer with step-by-step reasoning process. There are many sayings and metaphors about flirting, which one could be found in a machine shop?\nOptions:\n- feelings\n- sexual excitement\n- sparks fly\n- problems\n- unwanted pregnancy

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Sparks fly in flirting means having a spark between two people. A machine shop has various machines that can have spark fly.
The answer: sparks fly.
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