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]: Amphibians are the first true vertebrates with ____ limbs.
[EX A]: four

[EX Q]: Differentiation is caused by the energy going in ____ directions.
[EX A]: two

[EX Q]: Children usually become functionally blind within ____ years of diagnosis.
[EX A]:
three