Use reasoning to lead to the answer of the following question:
What past time are people engaged in when they are traveling along liquid?\nOptions:\n- sail boats\n- question authority\n- high fives\n- share things\n- learn from each other
 Reasoning process:
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People usually travel along liquid via boats. Sailing boats is the type of passtime people engage in while traveling along liquid. Therefore, the final answer is sail boats.
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