短文改错。（15分，每小题1.5分）
The Red Cross is an international organization. It provides the number of service
with the public, such as care for people, teaching them the knowledge of first aid (急
救) and helping people in need.
Mary is a 20-years-old girl. His mother is proud of her because of she is a nurse in
the Red Cross. As soon as Mary finished school, she joins the Red Cross and trained as a
nurse. She was taught that if she meets an accident, she should gave the first aid at once
and then send for a doctor. She studies hard and want to be an excellent nurse.