Помогите 10 класс .+Объяснить выбор видо-временной формы глагола.
Fill in the correct form of the verbs in brackets
The Tower of London 1)____ (build) by William the Conqueror in 1078 as a castle and palace. Since that time it 2)____ (expand) to its present size, and 3)___(use) as an Armoury, a zoo, a royal mint, a prison, and a museum. At the time when it was a prison a lot of people 4)____(lock) in the Tower for their religious beliefs or suspected treason. Anne Boleyn, Sir Walter Raleigh and Elisabeth the First 5)_____(shut up) there, too. Spies 6)____(imprison) in the Tower during both World Wars. Some of the prisoners 7)___ (allow) to walk in the grounds , live in comfortable rooms and receive visitors. Many convicted 8)____
(execute) publicly on Tower Hill. They 9)_____(behead) with the block and ax, which 10) ___(keep) and 11)___(show) in the Tower Armoury now. The Jewel House 12)____(situate) at the Tower. The collection of the Crown Jewels 13)____(keep) in it. Saint Edward’s Crown, the Imperial State Crown, and the royal sceptre 14)___(guard) there. Saint Edward’s Crown 15)____(use) for the coronation ceremonies..