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: Pigs grow very quickly and are normally ready for sale at ____ to six months of age.

A: four
****
Q: Team handball is played with seven players per side, six court players, and ____ goalkeeper.

A: one
****
Q: Arthropods are made up of four groups of living animals and ____ group of extinct animals.

A:
one
****