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: Gloves have ____ ridges or crevices in which the bacteria can hide.

SOLUTION: no

PROBLEM: International trade is a ____ way street.

SOLUTION: two

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

SOLUTION:
two