TASK DEFINITION: In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
PROBLEM: Men produce brand new sperm every _ to three months.

SOLUTION: two

PROBLEM: Plazas have _ accumulations of rubbish but are covered with even layers of mud bricks and plaster.

SOLUTION: no

PROBLEM: Binary relationships involve _ entities.

SOLUTION:
two