1 Choose the correct word or phrase. 1 Tower Bridge was / were completed in 1894. 2 Batteries was/ were invented in 1800 by Alessandro Volta. 3 In what year was discovered Pompeii/ Pompeii discovered? 4 The Eiffel Tower is / are visited by many people each year. 5 Refrigerators are / aren't used to keep food cold. 6 Is / Are the digital camera often used in photography?