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: Marsupials have ____ vaginas and a double uterus.

SOLUTION: two

PROBLEM: Acoustic instruments consist of ____ main parts neck, top, back and sides.

SOLUTION: four

PROBLEM: Many trees die in their first ____ years of life.

SOLUTION:
eight