whether or not,at the same time, owing to however,in order to, alternatively, providing that, what is more not only thus There are many things you can do (1) …………………………………. reduce pollution levels in the city. Firstly, to decrease the amount of traffic on the streets, you should ask yourself (2) ……………………… your car journey is really necessary. It could be cheaper and healthier to walk. As a matter of fact, it could even be quicker, (3) ………………………… the amount of traffic at certain times of the day. (4) ……………………….., you could use public transport, (5) ………………………… avoiding the stressful experience of driving in the city and (6) ………………………………. freeing yourself from the time-consuming necessity of finding a parking space. (7) …………………………, when it comes to speed, health and convenience, neither walking nor the public transport system can compare with the simple bicycle. (8) ……………………………. has it been proven to be faster than a car for most city journeys, but also you can park it almost anywhere (9) ……………………………… you lock it securely. (10) ……………………… it is the cleanest and most energy-efficient form of transport known to man.