It’s
not a natural object. It 1______ (was made) by man a long time ago. Now
it 2__________ (is seen) as a tourist attraction. It’s a famous old
building. It 3________ (was not built) by the Romans. Galileo, the famous
scientist, dropped heavy objects from this building to make his
experiments. The upper floor 4 _________ (was completed) in 1319. It
5_______ (was built) by Tommaso Pisano. The largest bell of the building 6
__________ (was installed) in 1655. The bell-chamber 7__________ (was added)
in 1372.