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]: Cleavage is good in ____ directions at right angles.
[EX A]: two

[EX Q]: Light chains exist in ____ classes, lambda and kappa.
[EX A]: two

[EX Q]: Kangaroos have ____ such pairs of chewing teeth.Grasslands are wide, open areas.
[EX A]:
four