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: Pathologists study four to ____ years after medical school and their postgraduate training.

SOLUTION: five

PROBLEM: Fitness has ____ components, aerobic and muscular.

SOLUTION: two

PROBLEM: Proboscis monkeys live in-groups of ____ to fifteen with an adult male as their leader.

SOLUTION:
five