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]: Tuataras reproduce very slowly, sometimes taking ____ years to reach sexual maturity.
[EX A]: ten

[EX Q]: Malaria kills up to ____ million people each year.
[EX A]: two

[EX Q]: Brook stickleback have prominent mouths, large eyes and ____ to six spines on their backs.
[EX A]:
four