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]: Avian kidneys have ____ kinds of nephrons.
[EX A]: two

[EX Q]: Female smokers enter menopause an average of ____ years earlier than nonsmokers.
[EX A]: five

[EX Q]: Magellanic penguins are the largest of the ____ ringed penguins and they are also the most numerous.
[EX A]:
four