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: Most healthy men experience about three to ____ erections in their sleep each night.

SOLUTION: five

PROBLEM: Nymphs are less than ____ millimeters in size.

SOLUTION: two

PROBLEM: Mice have four legs, four feet and ____ tail per unit-mouse.

SOLUTION:
one