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

[EX Q]: Plants grow to _ feet tall with feathery, smoky purple foliage.
[EX A]: four

[EX Q]: Aspiny neurons are of _ sizes.
[EX A]: two

[EX Q]: Most people start smoking again within the first _ months of quitting.
[EX A]:
three