TASK 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.
PROBLEM: Leonard Hofstadter:  Cats , Sheldon . You 're clearly upset about Amy being gone , and you 're trying to replace her with a bunch of cats .
Sheldon Cooper: Clowder .
Leonard Hofstadter: What ?
Sheldon Cooper: A group of cats is a clowder . Or a glaring .
Leonard Hofstadter: Okay , yeah , fine .
Sheldon Cooper: It 's the kind of thing you ought to know now that we have _ one _ .

SOLUTION: group

PROBLEM: Laura Petrie:  Darling , here 's , uh , Ritchie 's worms .
Rob Petrie: Oh .
Laura Petrie: Do n't let him play with them on the way up , huh ?
Rob Petrie: How does he play with worms ?
Laura Petrie: He tries to tie them all together and make one long _ one _ .

SOLUTION: worms

PROBLEM: Marcus Conway:  Detective , I would think very carefully before making these kinds of accusations .
Kate Beckett: Mr. Conway , I am not making any accusations . I am simply stating fact . We have a witness that heard you threatening Ella Hayes , and another _ one _ that saw you near where she was killed .
Richard Castle: Right about the same time she ended up that way .
Kate Beckett: You need to explain yourself .

SOLUTION:
witness