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: Scientists divide the mosses into ____ groups .

A: eight
****
Q: Monatomic elements have with ____ atoms in each per molecule.

A: three
****
Q: Some women have ____ periods at all, which makes it hard to tell if pregnancy has occurred.

A:
no
****