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: Wolves have ____ different types of fur.

SOLUTION: two

PROBLEM: Spiders have eight legs and usually have ____ eyes.

SOLUTION: eight

PROBLEM: Seasonal records indicate that, in most years, ____ generations occur.

SOLUTION:
two