II. Look at the signs. Choose the best answer (A, B, C or D) for the question 15 and 16. Câu hỏi What does the sign say? A. You drive as fast as you can. B. You stop right now. C. You drive to a speed at over 25 km/h when children are present. D. You drive slowly to a speed at no greater than 25km/h when children are present