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: Plants generally live ____ years but sometimes longer.

SOLUTION: two

PROBLEM: Most marine sediments are of ____ basic types.

SOLUTION: two

PROBLEM: Violets usually have ____ sepals at the base and have five petals.

SOLUTION:
five