What were they doing when the UFO l_____?
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WhatweretheydoingwhentheUFOl_____?WhatweretheydoingwhentheUFOl_____?WhatweretheydoingwhentheUFOl____
What were they doing when the UFO l_____?
What were they doing when the UFO l_____?
What were they doing when the UFO l_____?
landed
landed/left
left