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]: Girls have ____ ovaries.
[EX A]: two

[EX Q]: Birds have ____ basic types of feathers.
[EX A]: three

[EX Q]: Lights have ____ uses, to see and be seen.
[EX A]:
two