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A father and his son were travelling home in a car. It was snowing and a strong wind was blowing.As they were going over a bridge, they heard a loud bang and the father  lost control of the car. They were injured and their lives were in great danger. A helicopter took the father and the boy to hospital and they were saved. Now, the happy father is looking at his son and ( is) saying to him: "I will never drive my car when it is snowing/ snows. I promise you. It is ( was) very dangerous to drive when it is ( was) so slippery."