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: Plants produce seed at ____ years of age.

A: eight
****
Q: Some animals have only ____ or three chambers .

A: two
****
Q: Particles can be on ____ places at the same time.

A:
two
****