Listen to a talk about electricity and fill in the gaps. Track 9
 Electricity (1) ________ the most important inventions ever. It is the thing that powers the Earth. If (2) ________ no electricity, we’d be back in the dark ages. Few people stop and (3) ________ just how amazing electricity is. With the flick of a switch, you can (4) ________ almost anything. Think about (5) ________ happen if there was no electricity. We’d have no TV, no computers, no traffic signals. It would be like (6) ________ to living in caves. There are a few (7) ________ about electricity, of course. Number one, it’s dangerous. Thousands (8) ________ die each year from electrocuting themselves or in electrical fires. And number two, it (9) ________ for the environment. Most electricity comes from (10) ________ and that creates greenhouse gasses.