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]: Some children start asking questions when they're ____ or five years old.
[A]: four


[Q]: Some nurseries only take children aged ____ years and over.
[A]: two


[Q]: Mosquitoes have ____ body parts and six legs.
[A]:
three