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.

Q: Echinoderms have radial symmetry , many having ____ or multiples of five arms.

A: five
****
Q: Lunar eclipses occur every ____ months, on average.

A: six
****
Q: Cuckoos live less than ____ years in the wild.

A:
six
****