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

[EX Q]: World population continues to rise, even as a few countries move toward _ growth.
[EX A]: zero

[EX Q]: Morocco has _ perennial rivers and many dams have been built with potential for power generation.
[EX A]: four

[EX Q]: Charity is the mother of _ sisters, patience and obedience.
[EX A]:
two