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]: Water is the only substance on earth found naturally in ____ forms - solid, liquid, and gas.
[A]: three


[Q]: Hamsters can live to be ____ to four years old.
[A]: three


[Q]: Calves survive on their mother's fat-rich milk for six to ____ months.
[A]:
eight