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

[EX Q]: Tobacco kills four million people a year, one death every _ seconds.
[EX A]: eight

[EX Q]: Cancer can start in any of the _ sections or where the colon ends in the rectum.
[EX A]: four

[EX Q]: Quarks can have _ colors, red, green and blue.
[EX A]:
three