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

[EX Q]: Cardinals are approximately _ and three fourths inches in length.
[EX A]: eight

[EX Q]: Vitamins are classified into _ groups.
[EX A]: two

[EX Q]: Exposure can occur in _ general ways, ingestion, skin contact and inhalation.
[EX A]:
three