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: Manatees swim ____ to six miles per hour.

SOLUTION: two

PROBLEM: Dogs have to be ____ months old before they are spayed or neutered.

SOLUTION: six

PROBLEM: Insomnia can be short-lived, lasting only one to ____ nights.

SOLUTION:
two