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: Most species have ____ toes, three of which are forward-pointing.

A: four
****
Q: Banks hold ____ excess reserves and the public holds no currency.

A: no
****
Q: Whales have only ____ enemies-man and the killer whale.

A:
two
****