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: Variable stars fall into ____ major physical classifications.

A: four
****
Q: Most babies double their birthweight by ____ to five months.

A: four
****
Q: Scientists divide the mosses into ____ groups.

A:
eight
****