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

[Q]: Most turbines have either two or _ blades.
[A]: three


[Q]: Ticks mature in _ stages, moving from egg to larva and nymph to adult.
[A]: four


[Q]: Women have a longer life expectancy, outliving men by an average of seven to _ years.
[A]:
eight