TASK DEFINITION: In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
PROBLEM: Immune response improves in about _ weeks.

SOLUTION: four

PROBLEM: Most volcanoes erupt for _ to four weeks and then rest.

SOLUTION: three

PROBLEM: Pups are unable to swim or find food until seven to _ weeks old or until the ice melts .

SOLUTION:
eight