In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

[Q]: Flexible shapes are also shapes which have _ obvious way of being attacked.
[A]: no


[Q]: Diarrhea is an illness that kills _ and one-half million children per year.
[A]: three


[Q]: Angiosperms inhabit all _ continents, as well as the oceans.
[A]:
seven