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.

Babies crawl into a pouch on the mother's belly and stay there ____ months.
four

Kayak paddles have ____ blades, canoe paddles have one.
two

Cleavage is perfect in ____ directions, prismatic.

two