Vocabulary Unit 6

3. a device or system for supplying heat, esp central heating, to a building.
6. a system of buses, trains, etc, running on fixed routes, on which the public may travel.
7. a number of vehicles so obstructed that they can hardly move in the street.
8. an electric current or charge.
10. gasoline or fuel to move machines or vehicles.
12. where we wash the dishes in the kitchen.
14. a road or way.
16. a long, usually slender piece of wax with an embedded wick that is burned to give light.
18. discarded or wasted things, garbage.
20. harmful or poisonous substances introduced into an environment.
21. garbage can.

1. to treat or process (used or waste materials) so as to make suitable for reuse..
2. a system or process for controlling the temperature, humidity, and sometimes the purity of the air in an interior, as of an office, theater, laboratory, or house, especially one capable of cooling.
4. small piece of garbage or waste materials carelessly dropped, esp in public places.
5. any particular extent of space in the house.
9. a hanging piece of fabric used to shut out the light from a window, adorn a room, increase privacy, etc.
11. a machine for washing dishes, kitchen utensils, etc., automatically.
13. a tropical forest, usually of tall, densely growing, broad-leaved evergreen trees in an area of high annual rainfall..
15. a substance possessing perfect molecular mobility and the property of indefinite expansion, as opposed to a solid or liquid..
17. a device having one or more pins to which an electric cable is attached: used to make an electrical connection when inserted into a socket.
19. an electric light.
22. a valve by which water flows from a pipe can be controlled by opening and closing an orifice.