Topic: transportation. Could you please correct serious errors? Thank you! 1) Modern means of transportation are varied, fast and comfortable. 2) Depending on the distance you need to cover as well as your budget and preferences, you may get anywhere by air, water, railway or road using planes, ships, trains or cars. 3) Air travelling offers the advantage of speed, however, it is also the most expensive means of transportation. 4) Trains are also rather fast and more affordable than planes. 5) Travelling by boat is joyful, but limited by the water area. 6) Cars serve in the most convenient and private way, nevertheless there are problems of traffic jams and petrol prices. 7) However, there is one major disadvantage of all modern means of transport — they are harmful not only to a person who uses them but also to the environment and all the human beings. 8) Speaking about a big city, there should be means of transport which are plenty in number to carry crowds of people especially in rush hours and varied in price. 9) A metro line is a must for a megalopolis, as well as a sufficient number of trams, buses and trolleybuses.