完形填空 Louise was 72 years old and she lived by herself. The first thing she noticed when she came downstairs that Sunday morning was that her 1 window was open. In fact, it was so wide open that she had 2 closing it. Then she realized that things were not in their proper 3 . Finally, when she found her empty 4 on the kitchen table, she realized the awful 5 . At first, she didn't know what to do. Then she decided to 6 her son, Derek. Derek's wife Sybil answered the phone, 'It's your mother,' she 7 him, coldly. Louise told Derek about the open window, about things being in the wrong places and about the 8 missing from her purse. 'All right,' said Derek, 'Don't 9 anything. I'll be 10 in half an hour.' Louise 11 and made herself a pot of tea and some toast. Then she went from room to room wondering 12 anything else was missing. When Derek arrived, he was content to 13 her looking so calm. 'Have you rung the 14 ?' he asked. 'No? Then I'll do that straight away.' So he rang the police. As it was Sunday, 15 the only detectives were out. However, the police were polite, but vague （含糊的）. 'We'll send 16 round as soon as possible,' they said. Derek telephoned his wife. 'I'm not sure when I'll be home, love,' he told her. 'I've got to 17 for the police.' While Derek and his mother waited, Derek 18 the catches（挂钩）on the windows and locks on the doors. All of them were old and some of the catches hardly 19 at all. Derek felt 20 . His mother was an old woman, after all. 'I'll have to change all these,' he told her.