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]: Sexual maturity is between ____ and six years of age.
[EX A]: three

[EX Q]: Some animals have only ____ or three chambers .
[EX A]: two

[EX Q]: Revolution is recommended for use in dogs and cats ____ weeks of age and older.
[EX A]:
six