By the time he was twelve, Edison _______ to make a living by himself.
It shows that a knowledge of first aid can make a real .
The cool water stops the burning process,prevents the pain unbearable and reduces swelling.
Burns are called first,second or third degree burns, which layers of the skin are burned.
First aid is a temporary form of help to someone who suddenly falls ill or gets ——before a doctor can be found.
his first assignment at the office of a popular English newspaper.