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: Females become sexually mature at the age of ____ years.

SOLUTION: five

PROBLEM: All orthodontists are dentists, but only about ____ percent of dentists are orthodontists.

SOLUTION: six

PROBLEM: Blood clots can form in the legs after ____ or more hours sitting in a tight space.

SOLUTION:
four