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]: Llamas stand about ____ feet high at the shoulders.
[A]: four


[Q]: Most bioluminescence is blue for ____ reasons.
[A]: two


[Q]: Human gestation is divided into ____ trimesters of three months each.
[A]:
three