1. Unfortunately, few children behave in such a ---- manner towards the old and infirm.
2. The development of the experimental method to verify the theories had the ---- effect and there was a rapid increase in scientific knowledge.
3. We will have to hire more workers soon; we cant put it off ---- .
4. A well organised company that knows its products are of a high standard does not fear ---- .
5. When births outnumber deaths, the population increases; when the ---- is true, then it falls.