Definition: In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. Your answer should be chosen from the given text, and should not contain other words.
Input: Richard Castle:  How long do you think we 'll have to stand here ?
Kate Beckett: Once Bomb Disposal finishes their sweep . We 'll know if there are any other bombs you could step on or if I 'm standing on the only _ one _ .
Richard Castle: We do n't know that you 're standing on a bomb . Could be nothing .
Kate Beckett: Did n't feel like nothing . Something gave way under my feet . Felt like a trigger plate .
Richard Castle: Could be wonky floorboard .
Kate Beckett: With a metallic click ?
Richard Castle: Loose nail . That 's how floorboards get wonky .

bombs