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: Prions are protein molecules which have ____ metastable states.

SOLUTION: two

PROBLEM: Eye contact is important for ____ reasons.

SOLUTION: two

PROBLEM: Most massage therapists use techniques from ____ or more styles.

SOLUTION:
two