Read the following passage then choose the correct words. Tim was riding a motorbike when he had an (17) _____ . He fell off his motorbike and hit his head on the road. His head was hurt and it was badly bleeding. However, he was still (18) _____. It was an emergency so Mary called an/a (19) _____ in order to take him to Da Nang hospital. While waiting for the ambulance, Mary tried to stop the (20) _____ by using a handkerchief to cover the wound. ...