instruction:
In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
question:
Ostrichs only have _ toes, and one toenail.
answer:
two


question:
Coral reefs make up only _ per cent of the area of the Great Barrier Reef.
answer:
five


question:
Microbial inhabitants outnumber our body's own cells by about _ to one.
answer:

ten