In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

[EX Q]: Most divorces take place after three to _ years of marriage.
[EX A]: five

[EX Q]: Most insects have _ wings, but dipterans have only two.
[EX A]: four

[EX Q]: Permanent teeth emerge at about _ to four months of age.
[EX A]:
three