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: Birds have ____ beak, two wings, and two feet.

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

A: two
****
Q: Moths begin to emerge in about ____ weeks.

A:
two
****