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: Rabbits have ____ incisors in the upper jaw where rodents have only two.

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

A: eight
****
Q: Romantic love involves ____ people.

A:
two
****