How many kinds of doctors are there in the US? ______

There are [16]two kinds of doctors in the US, family doctors and specialists. [17]Family doctors have an office in the same area, where their patients live. They know most of the patients by name and [18]often check the health of everyone in the family. The other type of doctors—specialists, know a great deal about special health problems, such as [19]a heart disease, or a broken bone. It costs a lot of money to see a doctor in the US. Besides, medicines are also expensive. So, [20]medical insurance is very important in America.