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

[EX Q]: Gerbils get reproductive when they reach sexual maturity at the age of _ months.
[EX A]: three

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

[EX Q]: Most mammals have hair, and all land mammals have _ limbs.
[EX A]:
four