In 1173, the people of Pisa wanted to build a bell tower. They wanted the tower to be the most beautiful bell tower in all of 4. I----- . The city also needed a bell tower because the 5. c----- did not have one.
6. H----- , there was a problem. As soon as the third floor of the building was finished, the tower started to lean. Builders tried to make the building 7. s----- again as they added more floors, but they could not 8. f----- 9. o----- how to make it stop leaning. When the building was finished in 1350, it had eight 10. f----- and was 54.5 meters tall.
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