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]: Potential energy is divided into ____ different types of energy.
[A]: three


[Q]: Some women experience a labor of three to ____ days.
[A]: five


[Q]: Additives work in ____ different ways.
[A]:
two