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: Pacific salmon leave their home stream, swim out to sea and return ____ to six years later to spawn.

SOLUTION: one

PROBLEM: Knee arthroscopy is used basically in ____ ways.

SOLUTION: three

PROBLEM: Teething begins for most babies around ____ to six months.

SOLUTION:
four