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]: Presidential elections take place every ____ years.
[EX A]: four

[EX Q]: Humans grow with ____ sets of teeth.
[EX A]: two

[EX Q]: Hermit crabs have ____ breathing ways.
[EX A]:
two