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

[EX Q]: Cleavage is imperfect in _ directions, prismatically.
[EX A]: two

[EX Q]: Some dentists prefer using the oral rinse for _ to five days at a time.
[EX A]: three

[EX Q]: Females reach sexual maturity around _ to five year-olds.
[EX A]:
four