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: Fire occurs any time ____ elements are present - fuel, heat, oxygen and the chemical chain reaction.

SOLUTION: four

PROBLEM: Young bees spend the first ____ to three weeks of their lives carrying out functions within the hive.

SOLUTION: one

PROBLEM: Samarium is the fifth most abundant of the rare elements and is almost ____ times as common as tin.

SOLUTION:
four