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

[EX Q]: Some women experience a labor of three to _ days.
[EX A]: five

[EX Q]: Domestic violence occurs in _ in four families in Australia.
[EX A]: one

[EX Q]: Vertebrates exhibit all _ of the chordate characteristics at some point during their lives.
[EX A]:
three