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.

Calves are born after a gestation of ____ months.
nine

Nests Have at least one nest for every three to ____ hens.
four

Most objects have close to ____ net electric charge since they are made of neutral atoms.

zero