instruction:
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.
question:
Multiplications are always ____ complemental.
answer:
two


question:
Some programming languages have ____ or more standards .
answer:
two


question:
Barbershop harmony is a style of unaccompanied singing in which ____ voices harmonize to a melody.
answer:

three