instruction:
In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
question:
Some people routinely sleep only _ hours a night but feel fine during the day.
answer:
four


question:
Most smokers try to quit at least _ or six times before they succeed, researchers say.
answer:
five


question:
Ozone is comprised of _ oxygen molecules which acts as an oxidizer and bacterial disinfectant.
answer:

three