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: Niobium occurs primarily in ____ minerals, columbite and pyrochlore.

SOLUTION: two

PROBLEM: Milk is a good source of all ____ nutrients.

SOLUTION: three

PROBLEM: Joint life is a policy that covers ____ lives.

SOLUTION:
two