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: Dogs can begin gundog training as early as ____ months of age.

A: six
****
Q: Some tropical species have ____ or three generations per year.

A: two
****
Q: Children show ____ symptoms of lead poisoning until irreversible brain damage has occurred.

A:
no
****