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]: Photons have no mass and ____ electrical charge.
[A]: no


[Q]: Box turtles are mature and capable of mating at ____ years old.
[A]: five


[Q]: Most red knots live ____ or five years.
[A]:
four