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]: Mature females bear two or even ____ calves a year.
[EX A]: three

[EX Q]: Warthogs also sport ____ sharp tusks.
[EX A]: four

[EX Q]: Chronic insomnia is defined as having symptoms at least ____ nights per week for more than a month.
[EX A]:
three