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

[EX Q]: Woodchucks can dig up to three entrances to _ den.
[EX A]: one

[EX Q]: Most people go back to work within _ to three months after having a heart attack.
[EX A]: one

[EX Q]: Insomnia is defined as trouble falling asleep or staying asleep and affects _ in three adults.
[EX A]:
one