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]: Soy products contain ____ known classes of anti-cancer agents, including phytoestrogens.
[A]: five


[Q]: Kayak paddles have ____ blades, canoe paddles have one.
[A]: two


[Q]: Salt is categorized as ____ types, based on the method of production.
[A]:
four