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]: Alligator gars have ____ rows of teeth.
[A]: two


[Q]: Threshold is a value to avoid ____ divide.
[A]: zero


[Q]: Lampreys reach up to a length of four feet and as small as ____ inches.
[A]:
five