Some companies are thinking of ways to save natural _____ by making better use of the water used in the bathroom.
Some people waste a lot of food ________ others haven’t enough to eat.
When and where to build the new factory _____ yet.
I have many friends, ________ some are businessmen.
School children must be taught how to deal with dangerous ________.
The survey shows that ______ of the population in the country ______ adults.