Emma was on her way home when she heard a sudden scream. Looking around, she saw a little boy on the sidewalk gasping(急喘) for air, his (frighten) mother begging for help. Emma rushed to the boy, face had turned purple. "What's wrong?" "A candy! In his throat!" It was lucky that Emma had learned how (perform) the Heimlich maneuver(海姆利克急救法) at school. She acted quickly. Soon, the boy coughed up a piece of candy and began breathing again. He (save) in time.
