Part 1. 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 _. There are several possible answers, you'll need to choose the proper one. Carefully read the given text, pay special attention to the marked number, think about what (unwritten) information the marked number holds inside, choose the most adequate word(s) from the optional answers. If none of them seems right to you, there's also an option for other. If your answer is "REFERENCE", also write the reference entity, otherwise write the implicit option name. Options to choose from are:
REFERENCE: Some object which is being mentioned in the text before or after the target number. The reference answer has a higher priority than any other. If both Reference and another answer are possible, prioritize the Reference.
YEAR: Describing a calendric year
AGE: Describing someone's age
CURRENCY: Reference to some monetary value e.g dollar, euro etc.
PEOPLE: Describing a single/plural persons
TIME: Describing a time of the day. Usually you can add the word o'clock after those numbers.
OTHER: Some other option, which isn't listed here.
Part 2. Example
Jess Mastriani: No, I don't want another crooler, thank you very much.
 FBI Agent Nicole Scott: But it's good for you. It's got... honeyglaze. Please die for this crooler, Jess.
 Jess Mastriani: I've had _ two _ already. Who eats three croolers in a night? 
FBI Agent Nicole Scott: Take a look. [Nicole takes a huge bite] Mmmmm, Mmmmm, Mmmmm!
Answer: REFERENCE crooler
Explanation: In this example, the number two refers to something that appears in this text. In this example, it refers to the word: crooler.
Part 3. Exercise
Piper Halliwell:  So ... who 's bright idea was this , anyway ?
Phoebe Halliwell: We were trying to save you .
Piper Halliwell: Yeah ? Good job on that one .
Phoebe Halliwell: And who went and got her head stolen ?
Piper Halliwell: While you were off contemplating your navel , while you still had _ one _ ...
Paige Matthews: Guys , we are not getting anywhere arguing .
Piper Halliwell: Actually , we 're not getting anywhere because we do n't have any bodies .
Phoebe Halliwell: Okay , look . We said we were sorry .
Paige Matthews: Can we try looking on the bright side ? I mean , you know , we 're still alive .
Piper Halliwell: Only 'cause Zachary ca n't kill us in here .
Paige Matthews: I do n't think he would if he could . I mean , he practically apologized to us .
Phoebe Halliwell: I think she 's right , actually . I did n't sense any anger from him , just a lot of sorrow .
Piper Halliwell: So , what ? He did this to us just to get us out of the way ? To do what ?
Phoebe Halliwell: To get revenge on the school .
Paige Matthews: And Gideon .
Answer:
REFERENCE navel