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: Infertility affects one in ____ couples today.

SOLUTION: five

PROBLEM: Lions stand ____ feet tall at the shoulders.

SOLUTION: three

PROBLEM: Most sharks have ____ pairs of gill slits, but some have six or seven pairs.

SOLUTION:
five