Read the text. Put the verbs in the proper Passive forms. Explain why you have preferred one form to another.

The Tower of London _ 1 (to build) by William the Conqueror in 1078 as a castle and palace. Since that time it _ 2 (to expand) to its present size, and as an armory, a zoo, a royal mint, a prison and a museum. At the time when it was a prison a lot of people _ 3 (to lock) in the Tower. Anne Boleyn, Sir Walter Raleigh and Elizabeth the First _ 4 (to shut) there, too. Spies_ 5 (to imprison) in the Tower during the World Wars. Many convicted _ 6 (publicly/to execute) on the Tower Hill. They _ 7 (to behead) with the block and axe, which _ 8 (to keep) and _ 9 (to show) in the Tower of Armory now.
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