TASK DEFINITION: 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.
PROBLEM: Humans grow with ____ sets of teeth.

SOLUTION: two

PROBLEM: Salsa works on the basis of Mambo - a pattern of ____ steps danced over eight counts of music.

SOLUTION: six

PROBLEM: Cats have fur, ____ legs, and a tail the same as dogs do.

SOLUTION:
four