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.

Q: Lucky: I know you 're smart , Spot , but how do you handle pressure ? Solve this simple word problem in say , thirty seconds .
Spot: Ah - ha , no problem ! Two trains are heading toward each other , _ one _ at twenty - five miles an hour and the other at forty . They 're fifty miles apart and getting closer on the same track , but with no time to throw the switch , they collide , head on . All aboard perish and it 's all my fault !
Lucky: Next .

A: trains
****
Q: Doctor Who: D'you know what that is ?
D.84: It is a Laserson probe . It can punch a fist - sized hole in 6 " armor plate or take the crystals from a snowflake one by one .
Doctor Who: Yes . That 's right . No handyman should be without _ one _ .

A: probe
****
Q: Hercule Poirot: Do you think Shaitana played any card games ?
Major Despard: There is only one game that Shaitana played ... a low - down game . We all make mistakes . Even you , I dare say , have a failure now and then .
Hercule Poirot: Well , the last _ one _ was 28 years ago .

A:
failure
****