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: Today there are ____ mating pairs.

A: four
****
Q: Photosynthesis has ____ main sets of reactions.

A: two
****
Q: Mature birds boast a wing span of ____ feet.

A:
six
****