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: Neutrons consist of one up quark and ____ down quarks.

SOLUTION: two

PROBLEM: Theobroma oil can exist in four different polymorphic forms of which only ____ is stable.

SOLUTION: one

PROBLEM: Many portable extinguishers discharge completely in as few as eight to ____ seconds.

SOLUTION:
ten