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: Alligator gars have ____ rows of teeth.

SOLUTION: two

PROBLEM: Carbon is able to bond with up to ____ other elements.

SOLUTION: four

PROBLEM: Psychiatrists say that ____ out of four people are mentally ill.

SOLUTION:
one