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]: Some bird feeders have _ perches at all, but neither do tree trunks.
[EX A]: no

[EX Q]: Most women can become pregnant in about _ to three months after they stop taking the pill.
[EX A]:
one