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

[EX Q]: Cubs stay with their mothers for up to _ years.
[EX A]: three

[EX Q]: Trees can also be air layered but air layering usually takes four to _ months to be successful.
[EX A]: six

[EX Q]: Most children begin to stay dry at night around _ years of age.
[EX A]:
three