Prepare 4 Unit 6

a system of vehicles such as buses and trains which operate at regular times and that the public use

a container for waste that will be recycled, for example, paper or glass

the time when a lot of people are travelling to or from work and so roads and trains are very busy

things that you throw away because you do not want them

a line of cars, trucks, etc. that are moving slowly or not moving at all

a vehicle that hangs from thick cables and carries people up hills and mountains

damage caused to water, air, etc. by harmful substances or waste

areas of grass, trees or other plants in a town or city

large groups of people who are together in one place

writing or pictures painted on walls and public places, usually illegally

when the supply of electricity suddenly stops