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: Lunar eclipses occur every ____ months, on average.

SOLUTION: six

PROBLEM: Cells contain ____ families of small organic molecules.

SOLUTION: four

PROBLEM: Seeds germinate in about a month, but plants grown from seed take three to ____ years to flower.

SOLUTION:
five