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: Numbers can be positive or ____ only.

SOLUTION: zero

PROBLEM: Substance abusers have ____ hundred percent higher medical costs and benefits.

SOLUTION: three

PROBLEM: Attainment designation refers to the levels of ____ criteria pollutants in the air.

SOLUTION:
six