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]: Marine biologists have ____ theories on why whales breach.
[EX A]: two

[EX Q]: Cosmetics come in ____ types greasy and non-greasy.
[EX A]: two

[EX Q]: Genetic mapping divides the chromosomes in ____ bands.
[EX A]:
two