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: Most solenoids have ____ tabs with holes for mounting.

SOLUTION: two

PROBLEM: Sexual maturity occurs at ____ to four years for females and four to five years for males.

SOLUTION: three

PROBLEM: Molecular hydrogen has ____ main roles in interstellar space.

SOLUTION:
two