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]: Narwhals have ____ teeth in their upper jaw.
[A]: two


[Q]: Rodents contaminate ____ times more food than they eat.
[A]: ten


[Q]: Newborns have irregular sleep cycles that take about ____ months to mature.
[A]:
six