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

[EX Q]: Some seeds can remain dormant for up to _ years.
[EX A]: two

[EX Q]: Telescopes come in _ basic types - refractors and reflectors.
[EX A]: two

[EX Q]: Mice can have a new litter of babies every _ weeks.
[EX A]:
three