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: Earth is the third planet from the Sun in our solar system, which includes ____ other planets.

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

A: two
****
Q: HOD usually shows up as an acute lameness, often seeming to affect all ____ legs simultaneously.

A:
four
****