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: Brook stickleback have prominent mouths, large eyes and ____ to six spines on their backs.

SOLUTION: four

PROBLEM: Atoms are extremely small, on the order of a few ____ billionths of a meter.

SOLUTION: ten

PROBLEM: Comets have ____ distinct parts, the nuculeus, coma, and the ion tail.

SOLUTION:
three