Поставьте правильную форму неопределенного артикля перед…

A car-cars, a train-trains,an axle-axles,a crash-crashes,a line- lines, a speed-speeds, a delivery-deliveries,a coash-coaches,A departure-departures,a computer-computers, a freight-freights, a traffic-traffic,a box-boxes, an engine-engines, a railway-railways, a railwayman-railwaymen