阅读下面短文，从每小题所给的A、B、C、D四个选项中选出可以填入空白处的最佳选项。On a hot afternoon Rhiannon was driving her old van down the highway. As she 1 her window to let in some fresh air, her car registration paper blew off the sun visor (防晒板) and onto the floor inside. When leaning down to 2 it, she accidentally drifted into oncoming traffic, in panic, she over-corrected and pulled the 3 sharply in the other direction. 4 , the van rolled over three times, and Rhiannon was thrown onto the road, lying in the middle of the road and bleeding, nearly 5 .
A medical student witnessed the accident and came to her 6 . He covered Rhiannon with his coat and gave her emergency first aid, including 7 the wound on her left arm before the ambulance arrived.
8 , Rhiannon was rushed to a hospital where an emergency room doctor spent hours 9 all the pieces of windshield (挡风玻璃) from her arm, and gave her three dozen stitches (缝针).
Luckily, Rhiannon was saved. Not for the bandage, she would not have 10 long enough for the emergency personnel to arrive. Though Rhiannon didn't know him, she was grateful to the medical student who saved her life. So she 11 the words online, "It's a pity that I don't know your name. If you happen to see or hear this story and recognize yourself, thank you for your kind 12 ."
Rhiannon also had a message for the other 13 heroes, "Please consider this a pay-it-forward letter of 14 —a letter from the 15 you helped who, for whatever reason, couldn't thank you themselves."
