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: The Doctor:  Those shields wo n't hold them there for long .
Briggs: They 'll last until we 're back to Earth .
The Doctor: And then ?
Briggs: There 's only a few of them : our security men will cope with them .
The Doctor: They 're an invasion force , Earth is where they want to go . There are considerably more than a few on board .
Adric: How many of these silos are you carrying ?
Briggs: Oh , _ fifteen _ thousand or ...
Briggs: No
Briggs: . It 's not possible !

A: silos
****
Q: Chief Inspector Stanislaus Oates:  What exactly are you up to ? Or is it a state secret again ?
Albert Campion: I 'm taking the short road as opposed to the long road .
Chief Inspector Stanislaus Oates: Thank you very much , that 's much clearer .
Albert Campion: Or to express it in another way , it is the one occasion in a _ hundred _ when publicity would be catastrophic , official police involvement undesirable and it falls to the gifted private individual to take responsibility .
Chief Inspector Stanislaus Oates: And you are taking responsibility for what ?
Albert Campion: The safety of a great national treasure , coupled with a spot of drastic eradication .

A: occasion
****
Q: Hal Jordan:  As a Green Lantern , I face some of the nastiest villains in the galaxy . Then I met Star Sapphire . She was different . Easy on the eyes . And we actually had a lot in common . She was a humble Earthling who encountered some otherworldly beings , the Zamorans . They chose her to be a host body for their queen . I ca n't say I blame them . They even gave her a ring . But it came with a hitch : once that ring slid onto her finger , she was a changed woman . She became a being of pure evil , bent on the conquest of Earth . I never had any problems with ladies before , but like I said , this _ one _ is different .

A:
ladies
****