[填空题] A few months ago, millions of people in London heard (36)______all over the town. The Emergency services, the Fire Departments, the Police, hospitals, and (37)______stood by, ready to go into action. In railway underground stations, people read (38)______and maps which told them where to go and what to do in the emergency. This was Exercise Flood Call, to prepare people for a flood emergency. London wasn’’t flooded yet, but it is possible that it would be. In 1236 and in 1663, London was (39)______flooded. In 1928, people living in Westminster, the heart of London, drowned in floods. And in 19S3, one hundred people, living on the eastern edge of the London (40)______were killed, again, in the floods. At last, Greater London (41)______took actions to prevent this disaster from happening again. Though a flood wall was built in the 1960s, Londoners still must be prepared for the possible disaster. If it happens, SO underground stations will be under water. (42)______, gas and phone se