They often change the kind of crop in each field ____ few years, for example, growing corn or wheat and then the next year peas or soybeans.
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.
The workers do nothing but _______ tea and talk to each other.
Every year, a great many visitors come to visit the temple ______ the 12th century, ______ has brought a large income.