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

[EX Q]: Pups are unable to swim or find food until seven to _ weeks old or until the ice melts .
[EX A]: eight

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

[EX Q]: Chronic insomnia occurs on most nights for at least _ weeks.
[EX A]:
three