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

[EX Q]: Flatworms exhibit _ forms of life styles, free-living and parasitic.
[EX A]: two

[EX Q]: Most smokers try to quit at least _ or six times before they succeed, researchers say.
[EX A]: five

[EX Q]: Plagiarism is defined as the verbatim use of _ or more words from an unreferenced source.
[EX A]:
four