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: Manatees swim ____ to six miles per hour.

SOLUTION: two

PROBLEM: Most aquatic life does well in water with oxygen concentrations of ____ parts per million.

SOLUTION: nine

PROBLEM: Coffee trees reach maturity between ____ and four years when their clusters of fruit turn deep red.

SOLUTION:
three