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

[Q]: Ice jams cause flooding because of _ main features.
[A]: two


[Q]: Dwarf trees are diminutive and shrub-like, reaching _ feet or so at maturity.
[A]: four


[Q]: Viral croup is more common in children less than _ years of age.
[A]:
five