Put the verbs in brackets in the correct passive tense.

Put the verbs in brackets in the correct passive tense.
Did you know...?
The word kremlin 1 is used to describe a Russian castle or fortress. The Moscow Kremlin is the best known Kremlin of all.
The wall around the Moscow Kremlin dates back to 1156, and at first it 2 was мейд of wood.
Since then, it 3 has been rebuilt with stones.
The Kremlin 4 was used as the centre of Russian government until 1712.
Four palaces and four cathedrals are some of the structures that can 5 be seen at the Kremlin.
In 1990, the Moscow Kremlin 6 was named a World Heritage Site.
It 7 is estimated that over a million people visit the Kremlin every year and it 8 will be visited by many more tourists in the future.

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