Choose the word (a, b, c, or d) that best fits each of the blank space

 Choose the word (a, b, c, or d) that best fits each of the blank spaces. Yesterday, when I was riding along a busy street, I saw an (Question 21) __. A woman was knocked down when she crossed the street at a zebra crossing. Many people stopped (Question 22) ___ their help. A policeman arrived and asked a young man to telephone for an (Question 23) ____. While waiting for the ambulance, the policeman and some people tried to (Question 24) ___ the bleeding. They used a handkerchief to cover the wound, then put pressure on it and held it (Question 25) ___. They tried to talk to her in (Question 26) ___ to keep her (Question 27) __. After about three minutes, the ambulance (Question 28) ___ and the woman was taken to the hospital. Question 21.