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: Sharks have ____ gill slits on each side of the head.

SOLUTION: five

PROBLEM: Blood donors can give blood every ____ weeks, or six times a year.

SOLUTION: eight

PROBLEM: Coral reefs are the centerpiece of ____ sanctuaries.

SOLUTION:
three