Complete the text with who,whose, which or where.
A driver,_____ must have driven down the same street only a few minutes before, had lost control of his car.The car , _____had landed on its roof , burst into flames immediately. Mr O'Brian,_____quick thinking helped save the driver's life, got out of his car and saw that there was a man in the driver's seat.Mark phoned the fire brigade and then ran back to his own car,_____he kept a fire extinguisher. He rushed back to the scene just as another man was approaching. O'Brian and the other man,_____has not been seen since the accident. He was taken to hospital, ______his condition has been described as 'comfortable,'.