听力原文： One day, Mr. Lock received a visit from a salesman representing Bargain Electrics Ltd, who persuaded him to buy an electric drill for $ 60. He told Mr. Lock that if he sent a $15 deposit, they could send him the drill on a two-week home trial. If, after that time, he didn't want to keep the drill, he should send it back and his deposit would be refunded. The salesman assured Mr. Lock that ha was under no obligation to buy the drill if he didn't like it. Mr. Lock sent his deposit and received the drill a few days later. But when he tried it out he found it didn't work, and the same afternoon his wife saw exactly the same drill in a local shop for only $ 50. So he sent the drill back to Bargain Electrics with a letter. In the letter he explained that he didn't want the drill because it didn't work. Instead of getting his deposit hack, as he expected, Mr. Lock got a letter from Bargain Electrics in which they claimed that he had broken the drill by using it wrongly, and that he still owed them $45. (34)