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: Binary distillation is a separation of only ____ chemicals.

A: two
****
Q: Babies crawl into a pouch on the mother's belly and stay there ____ months.

A: four
****
Q: Calcite makes up ____ well known rocks limestone and marble.

A:
two
****