In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

[EX Q]: Unipolar motors have _ coils and are likely to have five or six wires attached.
[EX A]: four

[EX Q]: Pure water contains _ ions and is therefore a nonconductor .
[EX A]: no

[EX Q]: Diarrhoea kills three million children under _ every year.
[EX A]:
five