Imagine you are walking to school listening to music on your MP3 player. All of a (1) ... it stops working and you (2) ... that the batteries have (3) ... out. Wouldn't it be wonderful if you could simply recharge the batteries wherever you are? This might be possible in a few years' time as scientists are now working on a bag that makes electricity. They say that all someone needs to do is (4) ... the bag on their back and start walking. The movement of the body makes electricity in a special part of the bag. This new invention (5) ... like a brilliant idea, doesn't it? Scientists developed the "electric backpack" in order to help soldiers, who often carry around with them torches (фо­на­ри), radios and other equipment.

All these things run on batteries and at the moment, the soldiers (6) ... on these batteries to supply the (7) ... this equipment needs. With the "electric backpack", the soldiers won't need to carry extra batteries around with them. Rescue workers and mountain climbers will also find the bag useful, as will students who don't want their MP3 players to stop working by (8) ... on their way to school.