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: Milk is a good source of all ____ nutrients.

SOLUTION: three

PROBLEM: Food waste is transformed into soil-like humus in three to ____ days.

SOLUTION: seven

PROBLEM: Light stimulation activates ____ outward currents.

SOLUTION:
two