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: Girls have ____ ovaries.

SOLUTION: two

PROBLEM: Osteoporosis affects one in three women and one in ____ men.

SOLUTION: ten

PROBLEM: Fish have a ____ chambered heart.

SOLUTION:
two