Driving to Palm Springs two years ago, I met a snowstorm. A car suddenly changed the direction     1     (avoid) hitting mine and drifted (漂移) towards the side of the cliff. Meanwhile, some drivers     2    (sit) in different cars rushed out. They     3    (take) off the chains that had protected their own tyres and put them on that car’s tyres     4    (rapid). Just as the car was about to be lost off the cliff, those drivers stepped up, letting their kind hearts go beyond the snowstorm.