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]: All birds have ____ legs with four toes each.
[A]: two


[Q]: Elephants rise ____ inches when they inhale.
[A]: two


[Q]: Fraternal twins develop from ____ separately fertilized ova.
[A]:
two