instruction:
In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
question:
All insects have _ body sections, the head , thorax , and abdomen.
answer:
three

question:
Saturated bonds are when each of the carbons has _ single bonds as in the top figure.
answer:
four

question:
Solid lines are the sight-lines to the _ background QSOs.
answer:
three