Given a sentence, fill out the missing word with a 'no' or a number (between zero and ten). You should write the numbers with english alphabet, like: four instead of 4.

[Q]: Naiads have ____ caudal filaments and external gills.
[A]: two


[Q]: Most psychologists agree that the big ____ personality traits are stable across the life-span.
[A]: five


[Q]: Diplomacy happens a lot when ____ or more countries fight.
[A]:
two