TASK DEFINITION: In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
PROBLEM: Some herbaceous plants live only five to _ years.

SOLUTION: six

PROBLEM: Liquids usually descend in three to five seconds, and solids in _ to twenty seconds.

SOLUTION: eight

PROBLEM: Cichlids are popular in the aquarium hobby for a _ reason.

SOLUTION:
four