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: Banks hold ____ excess reserves and the public holds no currency.

SOLUTION: no

PROBLEM: Most amphibians reach maturity at three or ____ years.

SOLUTION: four

PROBLEM: Movement is aided by ____ sets of longitudinal muscles that extend throughout the entire body.

SOLUTION:
four