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: Photons have ____ mass and no electrical charge.

SOLUTION: no

PROBLEM: Hares hold their young ____ to ten days longer.

SOLUTION: seven

PROBLEM: Raspberries come in ____ colors, red, yellow, purple and black.

SOLUTION:
four