What can you do if you are not sure about the postage?
Ask ______.
In the traditional usage, sports refer to __ activities.
According to John May, the population expert from World Bank, the solution to the overpopulation in Africa is ______.
Instead of an aspect of nature, sports belong to the field of ______.
Service contract is a part of the deal.
You should avoid (meet) __ her in the street.