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: China has about one in ____ of all smokers in the world.

SOLUTION: four

PROBLEM: Sponges are subdivided into ____ classes.

SOLUTION: three

PROBLEM: Women are ____ times more likely than men to have episodes of clinical depression.

SOLUTION:
three