Given a sentence, fill out the missing word with a 'no' or a number (between zero and ten). You should write the numbers with english alphabet, like: four instead of 4.

Plants grow up to ____ feet tall and spread to about three feet.
three

Rifts develop from separate domes creating ____ legged rift faults that join each other.
three

Fluorescent tubes make white light in ____ stages.

two