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]: Crustaceans have ____ pairs of antennae.
[A]: two


[Q]: Tall fescue produces the ____ diazaphenanthrene alkaloids, perlolidone and perloline.
[A]: two


[Q]: State law requires every dog or cat be vaccinated at ____ months of age and annually thereafter.
[A]:
four