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.

[EX Q]: Owls have ____ toes on each foot, like most birds.
[EX A]: four

[EX Q]: Nitric oxide serves ____ main functions in the body.
[EX A]: three

[EX Q]: Cleavage is good in ____ directions forming cubes.
[EX A]:
three