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: Birds have ____ basic types of feathers.

SOLUTION: three

PROBLEM: Acupuncture needles are about two to ____ inches long.

SOLUTION: three

PROBLEM: Moles have ____ types of tunnels.

SOLUTION:
two