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]: Sexual maturity is reached at ____ years, and females calve every other year.
[EX A]: four

[EX Q]: Gorillas are sexually mature at ____ to nine years of age.
[EX A]: six

[EX Q]: Bronze is made by mixing ____ parts copper to one part tin.
[EX A]:
three