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.

[EX Q]: Males mature sexually as soon as ____ years of age.
[EX A]: two

[EX Q]: Cells contain ____ families of small organic molecules.
[EX A]: four

[EX Q]: Koalas can be up to ____ feet, six inches long.
[EX A]:
two