Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks.

      When you visit London, one of the first things you will see is Big Ben, the famous clock which can be heard all over the world on the BBC. If the Houses of Parliament hadn't burned down in 1834, the great clock would never have been erected. Big Ben takes its (25)______ from Sir Benjamin Hall who was responsible for the making of the clock when the new Houses of Parliament were being built. It is not only of immense size, (26)______is extremely accurate as well. Officials from Greenwich Observatory have the clock checked twice a day. On the BBC, you can hear the clock when it is actually striking because microphones (27)______ to the clock tower. Big Ben has rarely gone wrong .Once, however, it failed to give the correct time. A painter who had been working on the tower hung a pot of paint on one of the hands and slowed it (28)______.