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: Elephants have five toes on the fore feet and ____ on the hind feet.

A: four
****
Q: Soy products contain ____ known classes of anti-cancer agents, including phytoestrogens.

A: five
****
Q: Insects have six legs and ____ body segments.

A:
three
****