instruction:
In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
question:
Diatoms are in _ shells and make the water brown.
answer:
two


question:
Woodchucks can dig up to _ entrances to one den.
answer:
three


question:
Birds of prey have extremely sharp sight, up to _ times sharper than our eyesight.
answer:

eight