Hoàn thành câu

13 They used 18,038 pieces of iron to build the
tower.
18,038 pieces of iron
build the tower.
.... to
14 The Prince of Wales opened the tower.
The tower.....
of Wales.
...... by the Prince
15 Over six million people a year visit the Eiffel
Tower.
.... over six
The Eiffel Tower..
million people a year.
16 People know the Eiffel Tower all over the
world as the symbol of Paris.
The Eiffel Tower.....
the world as the symbol of Paris.
..... all over