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: Gil Grissom:  We need a treadmill ; a big _ one _ .
Nick Stokes: Alright , to do what ?
Gil Grissom: Exercise a bus .

A: treadmill
****
Q: Hospital Santa:  A Padlock ?
Security Guard J.Bailey: His mom used _ one _ when she kept him in the attic ... it helps him feel at home , especially at Christmas , every year around this time he tries to escape

A: Padlock
****
Q: DC Endeavour Morse:  Strange , there 's a blackboard there . Could you ... ? Each element is assigned a symbol : Typically an abbreviation of its name together with a unique one or two - digit atomic number . Can you write these down as I call then off ? So , 74 gives us Tungsten . 17 , Chlorine . _ 18 _ , Argon . 19 , Potassium . The elements spell out a name .
Chief Superintendent Bright: T.C.A.P Tucap ?
DC Endeavour Morse: No , not quite , sir , but you 're on the right lines .
DC Endeavour Morse: Um
DC Endeavour Morse: , the chemical symbol for Tungsten is n't Tu as you might expect . It 's W from the German Wolframite . And Potassium is n't P as you might expect but K after the Latin Kalium . Taken together they 're Tungsten ...
DC Endeavour Morse: ...
DC Endeavour Morse: Chorine ...
DC Endeavour Morse: ...
DC Endeavour Morse: Argon ...
DC Endeavour Morse: ...
DC Endeavour Morse: and Potassium .
DC Endeavour Morse: W
DC Endeavour Morse: - C - L - A - R - K. Wallace Clark .
Chief Superintendent Bright: Good
Chief Superintendent Bright: grief .
DI Fred Thursday: Derek 's father .
Chief Superintendent Bright: But there 's nothing to say he even knew the vicar .
DC Endeavour Morse: Ivy Clark , sir . Wallace 's wife is buried in the churchyard . The next plot but one to Lady Daphne Sloan . Reverend Monkford performed the service .
PC Jim Strange: Bloody hell , matey . That 's ...
DI Fred Thursday: Elementary .

A:
number
****