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: Wood consists of ____ distinct fuels.

SOLUTION: two

PROBLEM: Sexual reproduction involves the union of cells from ____ parents.

SOLUTION: two

PROBLEM: Saliva comes from ____ pairs of salivary glands, plus many smaller glands.

SOLUTION:
three