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: Amphibians have ____ legs, and often look like reptiles.

SOLUTION: four

PROBLEM: Birds have ____ basic types of feathers.

SOLUTION: three

PROBLEM: Some migraines have ____ headaches at all.

SOLUTION:
no