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]: Coho usually live for ____ years and grow rapidly in their final year.
[EX A]: three

[EX Q]: Mice get sexually mature by ____ weeks.
[EX A]:
eight