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.

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

Cardinals have ____ main functions in the church.
three

Bridge is a partnership game for ____ people deriving from the much older game of whist.
four