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.

[EX Q]: Photosynthesis has ____ main sets of reactions.
[EX A]: two

[EX Q]: Pertussis is highly contagious with symptoms that can linger six to ____ weeks.
[EX A]: ten

[EX Q]: Humpbacks come in ____ different colors, ranging from white to black to mottled.
[EX A]:
four