Read and fill in the blank space in the following passage

London’s Tower Bridge

London’s Tower Bridge is one of the most famous bridges in the world. The bridge, designed but the architect Horace Jones together with John Wolfe Barry, was finally completed in 1894. It (1)      ……….11,000 tons of steel to build the framework of the 265-meter-long bridge. Over time, the bridge has become one of London’s most famous (2)…………..

Taking photographs of the Tower Bridge is (3)   …….. favourite London tourist activity, but you can also go inside the bridge, where you’ll have a magnificent view over London from the walkway (4) ………… the two bridge towers. In 2014, glass floors were installed in the walkways, giving visitors another, unusual view from the bridge. The long glass floors, more than 40 meters above the river, allow you to watch the traffic over the Tower Bridge from above. It is particularly (5)……… to see the bridge open and close below your feet.