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]: Chromatography is unique because of ____ reasons.
[A]: three


[Q]: Seasonal records indicate that, in most years, ____ generations occur.
[A]: two


[Q]: Social science comes in ____ forms, which work together.
[A]:
two