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: Collages can have two or ____ layers.

SOLUTION: three

PROBLEM: Acoustic instruments consist of ____ main parts neck, top, back and sides.

SOLUTION: four

PROBLEM: Some deserts receive only ____ or four inches of rain a year.

SOLUTION:
three