instruction:
In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
question:
Temperatures occasionally fall below _ but only last a very short time.
answer:
zero

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

question:
Several species take _ full growing seasons to become established.
answer:
two