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]: Some nurseries only take children aged ____ years and over.
[A]: two


[Q]: Sponges are subdivided into ____ classes.
[A]: three


[Q]: Women usually inherit ____ X chromosomes-one from each parent.
[A]:
two