instruction:
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.
question:
Some nurseries only take children aged ____ years and over.
answer:
two

question:
Mature females bear two or even ____ calves a year.
answer:
three

question:
Heat has ____ mass .
answer:
no