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

[Q]: Carbon dioxide extinguishes fire by physically attacking all _ points of the fire triangle.
[A]: three

[Q]: Diffusion occurs between the capillaries of the _ blood supplies.
[A]: two

[Q]: Most healthy men experience about three to _ erections in their sleep each night.
[A]:
five