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: Liters are ____ places to the right of hectoliters.

SOLUTION: two

PROBLEM: Tin has ____ allotropic forms.

SOLUTION: two

PROBLEM: Some people routinely sleep only ____ hours a night but feel fine during the day.

SOLUTION:
four