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: Perennials are plants that live more than ____ growing seasons.

SOLUTION: two

PROBLEM: Scientists divide the mosses into ____ groups .

SOLUTION: eight

PROBLEM: Elephants give birth to ____ calf every four to nine years on average.

SOLUTION:
one