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]: Yellow fever begins suddenly after an incubation period of three to ____ days.
[EX A]: five

[EX Q]: Mages can select from ____ spheres of magic - fire, water, air, earth and astral.
[EX A]: five

[EX Q]: Protein has ____ calories of energy per gram.
[EX A]:
four