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]: Most dens are oval shape, six to nine feet long and about ____ feet in height and width.
[EX A]: six

[EX Q]: Lunar eclipses occur every ____ months, on average.
[EX A]: six

[EX Q]: Several insects have a ____ stage life cycle.
[EX A]:
four