The former focuses on the natural world; the________starts with human beings and studies howhuman being and their environment act upon each other.[ ]

How did you find him out ?— I _____ his name by chance on a list.[ ]

na, the number of cities is increasing_____development is recognized across the world

__________ is often the case with children, Amy was better by the time the doctor arrived.

I can’t find Mary. Where’s she —Sorry, I don’t know ______.