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: Hearing is acute by three or ____ weeks and kittens learn to determine what sounds mean.

A: four
****
Q: Monotremes are the egg-laying mammals, and there are just ____ species.

A:
three
****