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

[Q]: Carbon comes in _ kinds- dust, coconut shell or granulated.
[A]: three


[Q]: Most polyps cause no symptoms and take five to _ years to change to cancer.
[A]: seven


[Q]: Advanced monotheism recognises a universal sway of _ opposite forces.
[A]:
two